diff --git a/.rubocop.yml b/.rubocop.yml
index 1bb990a9f..7a89ddfdc 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -11,11 +11,14 @@ AllCops:
     - 'tmp/**/*'
     - 'bin/**/*'
     - 'vendor/bundle/**/*'
-  TargetRubyVersion: 2.0
+  TargetRubyVersion: 2.6
   # DefaultFormatter: fuubar
 Style/Alias:
   Enabled: false
 
+Style/SymbolArray:
+  EnforcedStyle: brackets
+
 Style/Documentation:
   Enabled: false
 
@@ -42,14 +45,20 @@ Metrics/LineLength:
 Style/RegexpLiteral:
   EnforcedStyle: mixed
 
-Style/TrailingCommaInLiteral:
+Style/TrailingCommaInArrayLiteral:
+  EnforcedStyleForMultiline: consistent_comma
+
+Style/TrailingCommaInHashLiteral:
   EnforcedStyleForMultiline: consistent_comma
 
 RSpec/InstanceVariable:
   Enabled: false
 
-Style/AccessorMethodName:
-  Enabled: false
+RSpec/MultipleExpectations:
+  Max: 20
+
+RSpec/NestedGroups:
+  Max: 5
 
 Lint/HandleExceptions:
   Enabled: false
diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 2b53afe35..1f42a6adc 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -1,17 +1,14 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2016-11-20 15:49:33 +0000 using RuboCop version 0.45.0.
+# on 2019-09-13 08:15:02 -0400 using RuboCop version 0.74.0.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-require: rubocop-rspec
-
-# Offense count: 2
+# Offense count: 1
 Lint/AmbiguousRegexpLiteral:
   Exclude:
-    - 'lib/flipper/instrumentation/metriks.rb'
     - 'lib/flipper/instrumentation/statsd.rb'
 
 # Offense count: 6
@@ -23,24 +20,21 @@ Lint/AssignmentInCondition:
     - 'lib/flipper/feature.rb'
     - 'lib/flipper/gate_values.rb'
 
-# Offense count: 1
-Lint/Eval:
+# Offense count: 2
+Lint/DuplicateMethods:
   Exclude:
-    - 'flipper.gemspec'
+    - 'lib/flipper/ui.rb'
+    - 'lib/flipper/ui/configuration.rb'
 
-# Offense count: 3
-Lint/HandleExceptions:
+# Offense count: 1
+# Configuration parameters: MaximumRangeSize.
+Lint/MissingCopEnableDirective:
   Exclude:
-    - 'spec/flipper/adapters/mongo_spec.rb'
-    - 'test/adapters/mongo_test.rb'
-    - 'test/helper.rb'
+    - 'lib/flipper/test/shared_adapter_test.rb'
 
-# Offense count: 24
+# Offense count: 21
 Lint/ShadowingOuterLocalVariable:
   Exclude:
-    - 'lib/flipper/adapters/active_record.rb'
-    - 'lib/flipper/adapters/instrumented.rb'
-    - 'lib/flipper/adapters/sequel.rb'
     - 'spec/flipper/api/v1/actions/actors_gate_spec.rb'
     - 'spec/flipper/api/v1/actions/percentage_of_actors_gate_spec.rb'
     - 'spec/flipper/api/v1/actions/percentage_of_time_gate_spec.rb'
@@ -48,70 +42,179 @@ Lint/ShadowingOuterLocalVariable:
     - 'spec/flipper/feature_spec.rb'
     - 'spec/flipper/types/group_spec.rb'
 
-# Offense count: 26
+# Offense count: 27
 Lint/UselessAssignment:
   Exclude:
     - 'lib/flipper/instrumentation/log_subscriber.rb'
     - 'lib/flipper/instrumentation/subscriber.rb'
-    - 'lib/flipper/ui/actions/groups_gate.rb'
     - 'spec/flipper/api/action_spec.rb'
     - 'spec/flipper/dsl_spec.rb'
     - 'spec/flipper/feature_spec.rb'
     - 'spec/flipper/gates/group_spec.rb'
-    - 'spec/flipper/instrumentation/metriks_subscriber_spec.rb'
     - 'spec/flipper/instrumentation/statsd_subscriber_spec.rb'
-    - 'spec/flipper_spec.rb'
     - 'spec/flipper/middleware/memoizer_spec.rb'
-    - 'test/helper.rb'
+    - 'spec/flipper_spec.rb'
 
-# Offense count: 27
+# Offense count: 35
 Metrics/AbcSize:
-  Max: 30
+  Max: 29
 
-# Offense count: 1
-# Configuration parameters: CountComments.
+# Offense count: 137
+# Configuration parameters: CountComments, ExcludedMethods.
+# ExcludedMethods: refine
 Metrics/BlockLength:
-  Max: 195
+  Max: 683
 
-# Offense count: 4
+# Offense count: 11
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 178
+  Max: 150
 
-# Offense count: 39
-# Configuration parameters: CountComments.
+# Offense count: 1
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, AllowHeredoc, AllowURI, URISchemes, IgnoreCopDirectives, IgnoredPatterns.
+# URISchemes: http, https
+Metrics/LineLength:
+  Max: 111
+
+# Offense count: 59
+# Configuration parameters: CountComments, ExcludedMethods.
 Metrics/MethodLength:
   Max: 23
 
-# Offense count: 65
+# Offense count: 18
+Naming/AccessorMethodName:
+  Enabled: false
+
+# Offense count: 25
+Naming/ConstantName:
+  Exclude:
+    - 'lib/flipper.rb'
+    - 'lib/flipper/adapters/active_support_cache_store.rb'
+    - 'lib/flipper/adapters/dalli.rb'
+    - 'lib/flipper/adapters/instrumented.rb'
+    - 'lib/flipper/adapters/memoizable.rb'
+    - 'lib/flipper/adapters/memory.rb'
+    - 'lib/flipper/adapters/mongo.rb'
+    - 'lib/flipper/adapters/operation_logger.rb'
+    - 'lib/flipper/adapters/pstore.rb'
+    - 'lib/flipper/adapters/redis.rb'
+    - 'lib/flipper/adapters/redis_cache.rb'
+    - 'lib/flipper/feature.rb'
+    - 'lib/flipper/gate_values.rb'
+    - 'lib/flipper/typecast.rb'
+    - 'lib/flipper/ui/decorators/feature.rb'
+
+# Offense count: 9
+# Configuration parameters: ExpectMatchingDefinition, Regex, IgnoreExecutableScripts, AllowedAcronyms.
+# AllowedAcronyms: CLI, DSL, ACL, API, ASCII, CPU, CSS, DNS, EOF, GUID, HTML, HTTP, HTTPS, ID, IP, JSON, LHS, QPS, RAM, RHS, RPC, SLA, SMTP, SQL, SSH, TCP, TLS, TTL, UDP, UI, UID, UUID, URI, URL, UTF8, VM, XML, XMPP, XSRF, XSS
+Naming/FileName:
+  Exclude:
+    - 'lib/flipper-active_record.rb'
+    - 'lib/flipper-active_support_cache_store.rb'
+    - 'lib/flipper-api.rb'
+    - 'lib/flipper-cloud.rb'
+    - 'lib/flipper-dalli.rb'
+    - 'lib/flipper-mongo.rb'
+    - 'lib/flipper-redis.rb'
+    - 'lib/flipper-sequel.rb'
+    - 'lib/flipper-ui.rb'
+
+# Offense count: 3
+RSpec/BeforeAfterAll:
+  Exclude:
+    - 'spec/spec_helper.rb'
+    - 'spec/rails_helper.rb'
+    - 'spec/support/**/*.rb'
+    - 'spec/flipper/adapters/active_record_spec.rb'
+    - 'spec/flipper/adapters/http_spec.rb'
+
+# Offense count: 45
+# Configuration parameters: Prefixes.
+# Prefixes: when, with, without
+RSpec/ContextWording:
+  Exclude:
+    - 'spec/flipper/adapters/http_spec.rb'
+    - 'spec/flipper/api/v1/actions/feature_spec.rb'
+    - 'spec/flipper/api/v1/actions/features_spec.rb'
+    - 'spec/flipper/api/v1/actions/percentage_of_actors_gate_spec.rb'
+    - 'spec/flipper/cloud_spec.rb'
+    - 'spec/flipper/feature_spec.rb'
+    - 'spec/flipper/gates/group_spec.rb'
+    - 'spec/flipper/instrumentation/log_subscriber_spec.rb'
+    - 'spec/flipper/middleware/memoizer_spec.rb'
+    - 'spec/flipper/registry_spec.rb'
+    - 'spec/flipper/ui/actions/actors_gate_spec.rb'
+    - 'spec/flipper/ui/actions/features_spec.rb'
+    - 'spec/flipper/ui/actions/groups_gate_spec.rb'
+
+# Offense count: 1
+# Configuration parameters: CustomIncludeMethods.
+RSpec/EmptyExampleGroup:
+  Exclude:
+    - 'spec/flipper/gates/actor_spec.rb'
+
+# Offense count: 137
 # Configuration parameters: Max.
 RSpec/ExampleLength:
   Enabled: false
 
-# Offense count: 2
-# Configuration parameters: CustomTransform.
+# Offense count: 1
+# Configuration parameters: CustomTransform, IgnoreMethods.
 RSpec/FilePath:
   Exclude:
     - 'spec/flipper/adapters/pstore_spec.rb'
-    - 'spec/integration_spec.rb'
 
-# Offense count: 91
-RSpec/InstanceVariable:
+# Offense count: 4
+RSpec/IteratedExpectation:
   Exclude:
-    - 'spec/flipper/adapters/operation_logger_spec.rb'
     - 'spec/flipper/dsl_spec.rb'
     - 'spec/flipper/feature_spec.rb'
+    - 'spec/flipper/gates/percentage_of_actors_spec.rb'
+    - 'spec/flipper/registry_spec.rb'
+
+# Offense count: 16
+# Configuration parameters: .
+# SupportedStyles: have_received, receive
+RSpec/MessageSpies:
+  EnforcedStyle: receive
+
+# Offense count: 34
+# Configuration parameters: AggregateFailuresByDefault.
+RSpec/MultipleExpectations:
+  Max: 20
+
+# Offense count: 449
+# Configuration parameters: IgnoreSharedExamples.
+RSpec/NamedSubject:
+  Enabled: false
+
+# Offense count: 7
+RSpec/NestedGroups:
+  Max: 5
+
+# Offense count: 2
+RSpec/RepeatedDescription:
+  Exclude:
+    - 'spec/flipper/gates/boolean_spec.rb'
+
+# Offense count: 2
+RSpec/RepeatedExample:
+  Exclude:
+    - 'spec/flipper/cloud_spec.rb'
+
+# Offense count: 1
+RSpec/ScatteredLet:
+  Exclude:
     - 'spec/flipper/instrumentation/log_subscriber_spec.rb'
-    - 'spec/flipper/ui/actions/add_feature_spec.rb'
-    - 'spec/flipper/ui/actions/features_spec.rb'
-    - 'spec/flipper/ui/decorators/feature_spec.rb'
-    - 'spec/flipper/ui/decorators/gate_spec.rb'
-    - 'spec/flipper/ui_spec.rb'
-    - 'spec/flipper_spec.rb'
-    - 'spec/integration_spec.rb'
 
-# Offense count: 15
-# Configuration parameters: IgnoreSymbolicNames.
+# Offense count: 4
+RSpec/SubjectStub:
+  Exclude:
+    - 'spec/flipper/adapters/sync_spec.rb'
+
+# Offense count: 17
+# Configuration parameters: IgnoreNameless, IgnoreSymbolicNames.
 RSpec/VerifiedDoubles:
   Exclude:
     - 'spec/flipper/api/v1/actions/features_spec.rb'
@@ -121,22 +224,24 @@ RSpec/VerifiedDoubles:
     - 'spec/flipper_spec.rb'
     - 'spec/integration_spec.rb'
 
-# Offense count: 2
-Style/AccessorMethodName:
+# Offense count: 1
+Security/Eval:
   Exclude:
-    - 'lib/flipper/adapters/memory.rb'
-    - 'lib/flipper/adapters/pstore.rb'
+    - 'flipper.gemspec'
 
-# Offense count: 7
-Style/ConstantName:
+# Offense count: 5
+Security/MarshalLoad:
   Exclude:
-    - 'lib/flipper.rb'
-    - 'lib/flipper/adapters/dalli.rb'
-    - 'lib/flipper/adapters/memoizable.rb'
-    - 'lib/flipper/adapters/memory.rb'
-    - 'lib/flipper/adapters/mongo.rb'
-    - 'lib/flipper/adapters/pstore.rb'
-    - 'lib/flipper/adapters/redis.rb'
+    - 'lib/flipper/adapters/redis_cache.rb'
+    - 'spec/flipper/adapters/redis_cache_spec.rb'
+
+# Offense count: 2
+# Configuration parameters: EnforcedStyle.
+# SupportedStyles: inline, group
+Style/AccessModifierDeclarations:
+  Exclude:
+    - 'lib/flipper/api/action.rb'
+    - 'lib/flipper/ui/action.rb'
 
 # Offense count: 3
 Style/DoubleNegation:
@@ -145,55 +250,45 @@ Style/DoubleNegation:
     - 'lib/flipper/gates/boolean.rb'
     - 'lib/flipper/typecast.rb'
 
-# Offense count: 7
-# Configuration parameters: ExpectMatchingDefinition, Regex, IgnoreExecutableScripts.
-Style/FileName:
-  Exclude:
-    - 'lib/flipper-active_record.rb'
-    - 'lib/flipper-api.rb'
-    - 'lib/flipper-active_support_cache_store.rb'
-    - 'lib/flipper-cloud.rb'
-    - 'lib/flipper-dalli.rb'
-    - 'lib/flipper-mongo.rb'
-    - 'lib/flipper-redis.rb'
-    - 'lib/flipper-sequel.rb'
-    - 'lib/flipper-ui.rb'
-
 # Offense count: 2
-# Configuration parameters: EnforcedStyle, SupportedStyles.
+# Cop supports --auto-correct.
+# Configuration parameters: EnforcedStyle.
 # SupportedStyles: format, sprintf, percent
 Style/FormatString:
   Exclude:
     - 'lib/flipper/instrumentation/log_subscriber.rb'
 
-# Offense count: 10
-# Configuration parameters: MinBodyLength.
-Style/GuardClause:
-  Exclude:
-    - 'lib/flipper/api/v1/actions/percentage_of_actors_gate.rb'
-    - 'lib/flipper/api/v1/actions/percentage_of_time_gate.rb'
-    - 'lib/flipper/gate_values.rb'
-    - 'lib/flipper/instrumentation/statsd_subscriber.rb'
-    - 'lib/flipper/instrumentation/subscriber.rb'
-    - 'lib/flipper/registry.rb'
-    - 'lib/flipper/typecast.rb'
+# Offense count: 2
+# Configuration parameters: .
+# SupportedStyles: annotated, template, unannotated
+Style/FormatStringToken:
+  EnforcedStyle: unannotated
 
 # Offense count: 1
+# Configuration parameters: AllowIfModifier.
 Style/IfInsideElse:
   Exclude:
     - 'lib/flipper/gates/actor.rb'
 
 # Offense count: 1
-Style/MethodMissing:
+Style/MethodMissingSuper:
   Exclude:
     - 'lib/flipper/types/actor.rb'
 
-Style/AccessorMethodName:
+# Offense count: 1
+Style/MissingRespondToMissing:
   Exclude:
-    - 'lib/flipper/adapter.rb'
-    - 'lib/flipper/adapters/http.rb'
-    - 'lib/flipper/adapters/instrumented.rb'
-    - 'lib/flipper/adapters/memoizable.rb'
-    - 'lib/flipper/adapters/operation_logger.rb'
-    - 'lib/flipper/adapters/memory.rb'
-    - 'lib/flipper/adapters/pstore.rb'
+    - 'lib/flipper/types/actor.rb'
+
+# Offense count: 5
+# Cop supports --auto-correct.
+# Configuration parameters: AutoCorrect, EnforcedStyle, IgnoredMethods.
+# SupportedStyles: predicate, comparison
+Style/NumericPredicate:
+  Exclude:
+    - 'spec/**/*'
+    - 'lib/flipper/api/v1/actions/percentage_of_actors_gate.rb'
+    - 'lib/flipper/api/v1/actions/percentage_of_time_gate.rb'
+    - 'lib/flipper/gates/percentage_of_actors.rb'
+    - 'lib/flipper/gates/percentage_of_time.rb'
+    - 'lib/flipper/types/percentage.rb'
diff --git a/Gemfile b/Gemfile
index 1dd7cc17b..6de5ff79d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 gemspec name: 'flipper'
 
@@ -6,25 +8,25 @@ Dir['flipper-*.gemspec'].each do |gemspec|
   gemspec(name: "flipper-#{plugin}", development_group: plugin)
 end
 
+gem 'minitest', '~> 5.8'
 gem 'pry'
-gem 'rake', '~> 12.3.3'
-gem 'shotgun', '~> 0.9'
-gem 'statsd-ruby', '~> 1.2.1'
-gem 'rspec', '~> 3.0'
 gem 'rack-test', '~> 0.6.3'
-gem 'sqlite3', "~> #{ENV['SQLITE3_VERSION'] || '1.3.11'}"
 gem 'rails', "~> #{ENV['RAILS_VERSION'] || '6.0.0'}"
-gem 'minitest', '~> 5.8'
-gem 'rubocop', '~> 0.45.0'
+gem 'rake', '~> 12.3.3'
+gem 'rspec', '~> 3.0'
+gem 'rubocop'
 gem 'rubocop-rspec'
+gem 'shotgun', '~> 0.9'
+gem 'sqlite3', "~> #{ENV['SQLITE3_VERSION'] || '1.3.11'}"
+gem 'statsd-ruby', '~> 1.2.1'
 gem 'webmock', '~> 3.0'
 
 group(:guard) do
   gem 'guard', '~> 2.15'
-  gem 'guard-rubocop', '~> 1.3'
-  gem 'guard-rspec', '~> 4.5'
   gem 'guard-bundler', '~> 2.2'
   gem 'guard-coffeescript', '~> 2.0'
+  gem 'guard-rspec', '~> 4.5'
+  gem 'guard-rubocop', '~> 1.3'
   gem 'guard-sass', '~> 1.6'
   gem 'rb-fsevent', '~> 0.9'
 end
diff --git a/Guardfile b/Guardfile
index b33cd0568..f6c92c071 100644
--- a/Guardfile
+++ b/Guardfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # A sample Guardfile
 # More info at https://github.com/guard/guard#readme
 
diff --git a/Rakefile b/Rakefile
old mode 100644
new mode 100755
index 89b55e785..d97a183d5
--- a/Rakefile
+++ b/Rakefile
@@ -1,5 +1,7 @@
 #!/usr/bin/env rake
-$LOAD_PATH.push File.expand_path('../lib', __FILE__)
+# frozen_string_literal: true
+
+$LOAD_PATH.push File.expand_path('lib', __dir__)
 require 'rake/testtask'
 require 'flipper/version'
 
@@ -25,19 +27,19 @@ end
 
 require 'rspec/core/rake_task'
 RSpec::Core::RakeTask.new(:spec) do |t|
-  t.rspec_opts = %w(--color)
+  t.rspec_opts = %w[--color]
 end
 
 namespace :spec do
   desc 'Run specs for UI queue'
   RSpec::Core::RakeTask.new(:ui) do |t|
-    t.rspec_opts = %w(--color)
+    t.rspec_opts = %w[--color]
     t.pattern = ['spec/flipper/ui/**/*_spec.rb', 'spec/flipper/ui_spec.rb']
   end
 end
 
 Rake::TestTask.new do |t|
-  t.libs = %w(lib test)
+  t.libs = %w[lib test]
   t.pattern = 'test/**/*_test.rb'
 end
 
diff --git a/flipper-active_record.gemspec b/flipper-active_record.gemspec
index 2b0de34f4..0e0f5cfbc 100644
--- a/flipper-active_record.gemspec
+++ b/flipper-active_record.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_active_record_files = lambda do |file|
   file =~ /active_record/
@@ -25,6 +27,6 @@ Gem::Specification.new do |gem|
   gem.version       = Flipper::VERSION
   gem.metadata      = Flipper::METADATA
 
-  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
   gem.add_dependency 'activerecord', '>= 4.2', '< 7'
+  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
 end
diff --git a/flipper-active_support_cache_store.gemspec b/flipper-active_support_cache_store.gemspec
index 8efa1bb98..db39372d8 100644
--- a/flipper-active_support_cache_store.gemspec
+++ b/flipper-active_support_cache_store.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_active_support_cache_store_files = lambda do |file|
   file =~ /active_support_cache_store/
@@ -21,6 +23,6 @@ Gem::Specification.new do |gem|
   gem.version       = Flipper::VERSION
   gem.metadata      = Flipper::METADATA
 
-  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
   gem.add_dependency 'activesupport', '>= 4.2', '< 7'
+  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
 end
diff --git a/flipper-api.gemspec b/flipper-api.gemspec
index c7a9c48c5..1380aa2f6 100644
--- a/flipper-api.gemspec
+++ b/flipper-api.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_api_files = lambda do |file|
   file =~ %r{(flipper)[\/-]api}
@@ -20,6 +22,6 @@ Gem::Specification.new do |gem|
   gem.version       = Flipper::VERSION
   gem.metadata      = Flipper::METADATA
 
-  gem.add_dependency 'rack', '>= 1.4', '< 3'
   gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
+  gem.add_dependency 'rack', '>= 1.4', '< 3'
 end
diff --git a/flipper-cloud.gemspec b/flipper-cloud.gemspec
index 505f8b973..098dff177 100644
--- a/flipper-cloud.gemspec
+++ b/flipper-cloud.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_cloud_files = lambda do |file|
   file =~ /cloud/
diff --git a/flipper-dalli.gemspec b/flipper-dalli.gemspec
index c5c804923..4024237a9 100644
--- a/flipper-dalli.gemspec
+++ b/flipper-dalli.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_dalli_files = lambda do |file|
   file =~ /dalli/
@@ -21,6 +23,6 @@ Gem::Specification.new do |gem|
   gem.version       = Flipper::VERSION
   gem.metadata      = Flipper::METADATA
 
-  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
   gem.add_dependency 'dalli', '>= 2.0', '< 3'
+  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
 end
diff --git a/flipper-moneta.gemspec b/flipper-moneta.gemspec
index f1af9b0c9..f5007ff4b 100644
--- a/flipper-moneta.gemspec
+++ b/flipper-moneta.gemspec
@@ -1,5 +1,7 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
 
 flipper_moneta_files = lambda do |file|
   file =~ /moneta/
diff --git a/flipper-mongo.gemspec b/flipper-mongo.gemspec
index 01aeab6b3..2b7c4ca6f 100644
--- a/flipper-mongo.gemspec
+++ b/flipper-mongo.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_mongo_files = lambda do |file|
   file =~ /mongo/
diff --git a/flipper-redis.gemspec b/flipper-redis.gemspec
index a8eeee805..0876fd918 100644
--- a/flipper-redis.gemspec
+++ b/flipper-redis.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_redis_files = lambda do |file|
   file =~ /redis/
diff --git a/flipper-rollout.gemspec b/flipper-rollout.gemspec
index 9d9e58379..afb1247cf 100644
--- a/flipper-rollout.gemspec
+++ b/flipper-rollout.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_rollout_files = lambda do |file|
   file =~ /rollout/
diff --git a/flipper-sequel.gemspec b/flipper-sequel.gemspec
index fa167650d..10511cb4d 100644
--- a/flipper-sequel.gemspec
+++ b/flipper-sequel.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_sequel_files = ->(file) { file =~ /sequel/ }
 
diff --git a/flipper-ui.gemspec b/flipper-ui.gemspec
index 7f99c027a..c8737db4d 100644
--- a/flipper-ui.gemspec
+++ b/flipper-ui.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 flipper_ui_files = lambda do |file|
   file =~ %r{(docs|examples|flipper)[\/-]ui}
@@ -21,8 +23,8 @@ Gem::Specification.new do |gem|
   gem.version       = Flipper::VERSION
   gem.metadata      = Flipper::METADATA
 
+  gem.add_dependency 'erubi', '>= 1.0.0', '< 2.0.0'
+  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
   gem.add_dependency 'rack', '>= 1.4', '< 3'
   gem.add_dependency 'rack-protection', '>= 1.5.3', '< 2.1.0'
-  gem.add_dependency 'flipper', "~> #{Flipper::VERSION}"
-  gem.add_dependency 'erubi', '>= 1.0.0', '< 2.0.0'
 end
diff --git a/flipper.gemspec b/flipper.gemspec
index 05eedfaf3..28b71cf62 100644
--- a/flipper.gemspec
+++ b/flipper.gemspec
@@ -1,6 +1,8 @@
 # -*- encoding: utf-8 -*-
-require File.expand_path('../lib/flipper/version', __FILE__)
-require File.expand_path('../lib/flipper/metadata', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/flipper/version', __dir__)
+require File.expand_path('lib/flipper/metadata', __dir__)
 
 plugin_files = []
 plugin_test_files = []
diff --git a/lib/flipper-active_record.rb b/lib/flipper-active_record.rb
index e90cb0d63..7ee57cf83 100644
--- a/lib/flipper-active_record.rb
+++ b/lib/flipper-active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'activesupport/lazy_load_hooks'
 
 ActiveSupport.on_load(:active_record) do
diff --git a/lib/flipper-active_support_cache_store.rb b/lib/flipper-active_support_cache_store.rb
index 7d6c343d2..081e0fd58 100644
--- a/lib/flipper-active_support_cache_store.rb
+++ b/lib/flipper-active_support_cache_store.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/adapters/active_support_cache_store'
diff --git a/lib/flipper-api.rb b/lib/flipper-api.rb
index a3a228d64..155cc553f 100644
--- a/lib/flipper-api.rb
+++ b/lib/flipper-api.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/api'
diff --git a/lib/flipper-cloud.rb b/lib/flipper-cloud.rb
index dccb59d34..509873268 100644
--- a/lib/flipper-cloud.rb
+++ b/lib/flipper-cloud.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require "flipper/cloud"
diff --git a/lib/flipper-dalli.rb b/lib/flipper-dalli.rb
index ec5341cd9..1c5ef33d5 100644
--- a/lib/flipper-dalli.rb
+++ b/lib/flipper-dalli.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/adapters/dalli'
diff --git a/lib/flipper-mongo.rb b/lib/flipper-mongo.rb
index 8116aacad..9bf0f8599 100644
--- a/lib/flipper-mongo.rb
+++ b/lib/flipper-mongo.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/adapters/mongo'
diff --git a/lib/flipper-redis.rb b/lib/flipper-redis.rb
index 3c16cc609..780458ecf 100644
--- a/lib/flipper-redis.rb
+++ b/lib/flipper-redis.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/adapters/redis'
diff --git a/lib/flipper-sequel.rb b/lib/flipper-sequel.rb
index dee0621c9..3a0050d3e 100644
--- a/lib/flipper-sequel.rb
+++ b/lib/flipper-sequel.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/adapters/sequel'
diff --git a/lib/flipper-ui.rb b/lib/flipper-ui.rb
index b04f9d634..1036ffdab 100644
--- a/lib/flipper-ui.rb
+++ b/lib/flipper-ui.rb
@@ -1 +1,3 @@
+# frozen_string_literal: true
+
 require 'flipper/ui'
diff --git a/lib/flipper.rb b/lib/flipper.rb
index 654a7d65a..6b2e93064 100644
--- a/lib/flipper.rb
+++ b/lib/flipper.rb
@@ -1,7 +1,11 @@
+# frozen_string_literal: true
+
 require "forwardable"
 
 module Flipper
-  extend self # rubocop:disable Style/ModuleFunction
+  # rubocop:disable Style/ModuleFunction
+  extend self
+  # rubocop:enable Style/ModuleFunction
   extend Forwardable
 
   # Private: The namespace for all instrumented events.
diff --git a/lib/flipper/actor.rb b/lib/flipper/actor.rb
index e434ecbed..90a77d505 100644
--- a/lib/flipper/actor.rb
+++ b/lib/flipper/actor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Simple class for turning a flipper_id into an actor that can be based
 # to Flipper::Feature#enabled?.
 module Flipper
diff --git a/lib/flipper/adapter.rb b/lib/flipper/adapter.rb
index 3d4737b63..b0a06e0ae 100644
--- a/lib/flipper/adapter.rb
+++ b/lib/flipper/adapter.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "set"
 require "flipper/feature"
 require "flipper/adapters/sync/synchronizer"
diff --git a/lib/flipper/adapters/active_record.rb b/lib/flipper/adapters/active_record.rb
index 1abb5718d..393d20217 100644
--- a/lib/flipper/adapters/active_record.rb
+++ b/lib/flipper/adapters/active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 require 'flipper'
 require 'active_record'
@@ -188,8 +190,8 @@ def enable_multi(feature, gate, thing)
           g.value = thing.value.to_s
         end
       rescue ::ActiveRecord::RecordNotUnique
-      rescue ::ActiveRecord::StatementInvalid => error
-        raise unless error.message =~ /unique/i
+      rescue ::ActiveRecord::StatementInvalid => e
+        raise unless e.message =~ /unique/i
       end
 
       def result_for_feature(feature, db_gates)
diff --git a/lib/flipper/adapters/active_support_cache_store.rb b/lib/flipper/adapters/active_support_cache_store.rb
index a3b43a54b..4fb7d6ac3 100644
--- a/lib/flipper/adapters/active_support_cache_store.rb
+++ b/lib/flipper/adapters/active_support_cache_store.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper'
 
 module Flipper
@@ -8,10 +10,10 @@ module Adapters
     class ActiveSupportCacheStore
       include ::Flipper::Adapter
 
-      Version = 'v1'.freeze
-      Namespace = "flipper/#{Version}".freeze
-      FeaturesKey = "#{Namespace}/features".freeze
-      GetAllKey = "#{Namespace}/get_all".freeze
+      Version = 'v1'
+      Namespace = "flipper/#{Version}"
+      FeaturesKey = "#{Namespace}/features"
+      GetAllKey = "#{Namespace}/get_all"
 
       # Private
       def self.key_for(key)
diff --git a/lib/flipper/adapters/dalli.rb b/lib/flipper/adapters/dalli.rb
index d98f2e685..35435a6e0 100644
--- a/lib/flipper/adapters/dalli.rb
+++ b/lib/flipper/adapters/dalli.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'dalli'
 require 'flipper'
 
@@ -8,10 +10,10 @@ module Adapters
     class Dalli
       include ::Flipper::Adapter
 
-      Version = 'v1'.freeze
-      Namespace = "flipper/#{Version}".freeze
-      FeaturesKey = "#{Namespace}/features".freeze
-      GetAllKey = "#{Namespace}/get_all".freeze
+      Version = 'v1'
+      Namespace = "flipper/#{Version}"
+      FeaturesKey = "#{Namespace}/features"
+      GetAllKey = "#{Namespace}/get_all"
 
       # Private
       def self.key_for(key)
diff --git a/lib/flipper/adapters/http.rb b/lib/flipper/adapters/http.rb
index 4b41e66a8..1699f5be2 100644
--- a/lib/flipper/adapters/http.rb
+++ b/lib/flipper/adapters/http.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'net/http'
 require 'json'
 require 'set'
diff --git a/lib/flipper/adapters/http/client.rb b/lib/flipper/adapters/http/client.rb
index 1e693f876..9de93af01 100644
--- a/lib/flipper/adapters/http/client.rb
+++ b/lib/flipper/adapters/http/client.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'uri'
 require 'openssl'
 require 'flipper/version'
@@ -12,7 +14,7 @@ class Client
           'User-Agent' => "Flipper HTTP Adapter v#{VERSION}",
         }.freeze
 
-        HTTPS_SCHEME = "https".freeze
+        HTTPS_SCHEME = "https"
 
         def initialize(options = {})
           @uri = URI(options.fetch(:url))
diff --git a/lib/flipper/adapters/http/error.rb b/lib/flipper/adapters/http/error.rb
index 6eff84bf6..d816a4e08 100644
--- a/lib/flipper/adapters/http/error.rb
+++ b/lib/flipper/adapters/http/error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Adapters
     class Http
diff --git a/lib/flipper/adapters/instrumented.rb b/lib/flipper/adapters/instrumented.rb
index f102769c9..1c98194f4 100644
--- a/lib/flipper/adapters/instrumented.rb
+++ b/lib/flipper/adapters/instrumented.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 module Flipper
@@ -8,7 +10,7 @@ class Instrumented < SimpleDelegator
       include ::Flipper::Adapter
 
       # Private: The name of instrumentation events.
-      InstrumentationName = "adapter_operation.#{InstrumentationNamespace}".freeze
+      InstrumentationName = "adapter_operation.#{InstrumentationNamespace}"
 
       # Private: What is used to instrument all the things.
       attr_reader :instrumenter
diff --git a/lib/flipper/adapters/memoizable.rb b/lib/flipper/adapters/memoizable.rb
index 8f3112c39..869cb0c0d 100644
--- a/lib/flipper/adapters/memoizable.rb
+++ b/lib/flipper/adapters/memoizable.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 module Flipper
diff --git a/lib/flipper/adapters/memory.rb b/lib/flipper/adapters/memory.rb
index 71f334024..215eda204 100644
--- a/lib/flipper/adapters/memory.rb
+++ b/lib/flipper/adapters/memory.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 
 module Flipper
diff --git a/lib/flipper/adapters/moneta.rb b/lib/flipper/adapters/moneta.rb
index 34f61f86d..f2d0f69f5 100644
--- a/lib/flipper/adapters/moneta.rb
+++ b/lib/flipper/adapters/moneta.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'moneta'
 
 module Flipper
diff --git a/lib/flipper/adapters/mongo.rb b/lib/flipper/adapters/mongo.rb
index af8aebb8f..361b2de2c 100644
--- a/lib/flipper/adapters/mongo.rb
+++ b/lib/flipper/adapters/mongo.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 require 'flipper'
 require 'mongo'
diff --git a/lib/flipper/adapters/operation_logger.rb b/lib/flipper/adapters/operation_logger.rb
index 54ba544d1..517e512b3 100644
--- a/lib/flipper/adapters/operation_logger.rb
+++ b/lib/flipper/adapters/operation_logger.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 module Flipper
diff --git a/lib/flipper/adapters/pstore.rb b/lib/flipper/adapters/pstore.rb
index 37156df22..e58ac5f72 100644
--- a/lib/flipper/adapters/pstore.rb
+++ b/lib/flipper/adapters/pstore.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'pstore'
 require 'set'
 require 'flipper'
diff --git a/lib/flipper/adapters/read_only.rb b/lib/flipper/adapters/read_only.rb
index 9e6ecaa52..b26abe593 100644
--- a/lib/flipper/adapters/read_only.rb
+++ b/lib/flipper/adapters/read_only.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper'
 
 module Flipper
diff --git a/lib/flipper/adapters/redis.rb b/lib/flipper/adapters/redis.rb
index 52fb6cf90..664fbacbf 100644
--- a/lib/flipper/adapters/redis.rb
+++ b/lib/flipper/adapters/redis.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 require 'redis'
 require 'flipper'
diff --git a/lib/flipper/adapters/redis_cache.rb b/lib/flipper/adapters/redis_cache.rb
index 1742377ce..890e0cec3 100644
--- a/lib/flipper/adapters/redis_cache.rb
+++ b/lib/flipper/adapters/redis_cache.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'redis'
 require 'flipper'
 
@@ -8,10 +10,10 @@ module Adapters
     class RedisCache
       include ::Flipper::Adapter
 
-      Version = 'v1'.freeze
-      Namespace = "flipper/#{Version}".freeze
-      FeaturesKey = "#{Namespace}/features".freeze
-      GetAllKey = "#{Namespace}/get_all".freeze
+      Version = 'v1'
+      Namespace = "flipper/#{Version}"
+      FeaturesKey = "#{Namespace}/features"
+      GetAllKey = "#{Namespace}/get_all"
 
       # Private
       def self.key_for(key)
diff --git a/lib/flipper/adapters/rollout.rb b/lib/flipper/adapters/rollout.rb
index 4e268f4b6..71a911450 100644
--- a/lib/flipper/adapters/rollout.rb
+++ b/lib/flipper/adapters/rollout.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper'
 
 module Flipper
diff --git a/lib/flipper/adapters/sequel.rb b/lib/flipper/adapters/sequel.rb
index 14ac235a1..2af6a65e0 100644
--- a/lib/flipper/adapters/sequel.rb
+++ b/lib/flipper/adapters/sequel.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 require 'flipper'
 require 'sequel'
diff --git a/lib/flipper/adapters/sync.rb b/lib/flipper/adapters/sync.rb
index f7f72d658..600947257 100644
--- a/lib/flipper/adapters/sync.rb
+++ b/lib/flipper/adapters/sync.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "flipper/adapters/sync/synchronizer"
 require "flipper/adapters/sync/interval_synchronizer"
 
diff --git a/lib/flipper/adapters/sync/feature_synchronizer.rb b/lib/flipper/adapters/sync/feature_synchronizer.rb
index f778755eb..ef8ec7ecf 100644
--- a/lib/flipper/adapters/sync/feature_synchronizer.rb
+++ b/lib/flipper/adapters/sync/feature_synchronizer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "flipper/actor"
 require "flipper/gate_values"
 
@@ -34,9 +36,11 @@ def initialize(feature, local_gate_values, remote_gate_values)
         def call
           if remote_disabled?
             return if local_disabled?
+
             @feature.disable
           elsif remote_boolean_enabled?
             return if local_boolean_enabled?
+
             @feature.enable
           else
             @feature.disable if local_boolean_enabled?
diff --git a/lib/flipper/adapters/sync/interval_synchronizer.rb b/lib/flipper/adapters/sync/interval_synchronizer.rb
index 7d777f4a0..89f2d39b2 100644
--- a/lib/flipper/adapters/sync/interval_synchronizer.rb
+++ b/lib/flipper/adapters/sync/interval_synchronizer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Adapters
     class Sync
diff --git a/lib/flipper/adapters/sync/synchronizer.rb b/lib/flipper/adapters/sync/synchronizer.rb
index 847f7e3d7..adcd09d44 100644
--- a/lib/flipper/adapters/sync/synchronizer.rb
+++ b/lib/flipper/adapters/sync/synchronizer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "flipper/feature"
 require "flipper/gate_values"
 require "flipper/adapters/sync/feature_synchronizer"
@@ -51,8 +53,8 @@ def sync
           features_to_remove.each { |key| Feature.new(key, @local).remove }
 
           nil
-        rescue => exception
-          @instrumenter.instrument("synchronizer_exception.flipper", exception: exception)
+        rescue StandardError => e
+          @instrumenter.instrument("synchronizer_exception.flipper", exception: e)
           raise if @raise
         end
       end
diff --git a/lib/flipper/api.rb b/lib/flipper/api.rb
index 06bd796b8..e77954d35 100644
--- a/lib/flipper/api.rb
+++ b/lib/flipper/api.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rack'
 require 'flipper'
 require 'flipper/api/middleware'
@@ -5,11 +7,11 @@
 
 module Flipper
   module Api
-    CONTENT_TYPE = 'application/json'.freeze
+    CONTENT_TYPE = 'application/json'
 
     def self.app(flipper = nil, options = {})
       env_key = options.fetch(:env_key, 'flipper')
-      app = ->(_) { [404, { 'Content-Type'.freeze => CONTENT_TYPE }, ['{}'.freeze]] }
+      app = ->(_) { [404, { 'Content-Type' => CONTENT_TYPE }, ['{}']] }
       builder = Rack::Builder.new
       yield builder if block_given?
       builder.use Flipper::Api::JsonParams
diff --git a/lib/flipper/api/action.rb b/lib/flipper/api/action.rb
index bfd684c76..062c40b53 100644
--- a/lib/flipper/api/action.rb
+++ b/lib/flipper/api/action.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 require 'flipper/api/error'
 require 'flipper/api/error_response'
@@ -18,11 +20,11 @@ def feature_name
 
       extend Forwardable
 
-      VALID_REQUEST_METHOD_NAMES = Set.new([
-                                             'get'.freeze,
-                                             'post'.freeze,
-                                             'put'.freeze,
-                                             'delete'.freeze,
+      VALID_REQUEST_METHOD_NAMES = Set.new(%w[
+                                             get
+                                             post
+                                             put
+                                             delete
                                            ]).freeze
 
       # Public: Call this in subclasses so the action knows its route.
diff --git a/lib/flipper/api/action_collection.rb b/lib/flipper/api/action_collection.rb
index 7fdaa366b..fc2e072b9 100644
--- a/lib/flipper/api/action_collection.rb
+++ b/lib/flipper/api/action_collection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Api
     # Internal: Used to detect the action that should be used in the middleware.
diff --git a/lib/flipper/api/error.rb b/lib/flipper/api/error.rb
index e1db2fbb1..d4d780230 100644
--- a/lib/flipper/api/error.rb
+++ b/lib/flipper/api/error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Api
     # All flipper api errors inherit from this.
diff --git a/lib/flipper/api/error_response.rb b/lib/flipper/api/error_response.rb
index b2d10bba7..8633ca360 100644
--- a/lib/flipper/api/error_response.rb
+++ b/lib/flipper/api/error_response.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Api
     module ErrorResponse
diff --git a/lib/flipper/api/json_params.rb b/lib/flipper/api/json_params.rb
index 14d79a172..0124bd326 100644
--- a/lib/flipper/api/json_params.rb
+++ b/lib/flipper/api/json_params.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rack/utils'
 
 module Flipper
@@ -9,9 +11,9 @@ def initialize(app)
         @app = app
       end
 
-      CONTENT_TYPE = 'CONTENT_TYPE'.freeze
-      QUERY_STRING = 'QUERY_STRING'.freeze
-      REQUEST_BODY = 'rack.input'.freeze
+      CONTENT_TYPE = 'CONTENT_TYPE'
+      QUERY_STRING = 'QUERY_STRING'
+      REQUEST_BODY = 'rack.input'
 
       # Public: Merge request body params with query string params
       # This way can access all params with Rack::Request#params
@@ -34,6 +36,7 @@ def call(env)
       # This method accomplishes similar functionality
       def update_params(env, data)
         return if data.empty?
+
         parsed_request_body = JSON.parse(data)
         parsed_query_string = parse_query(env[QUERY_STRING])
         parsed_query_string.merge!(parsed_request_body)
diff --git a/lib/flipper/api/middleware.rb b/lib/flipper/api/middleware.rb
index 74423e395..d6e8e53e3 100644
--- a/lib/flipper/api/middleware.rb
+++ b/lib/flipper/api/middleware.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rack'
 require 'flipper/api/action_collection'
 
diff --git a/lib/flipper/api/v1/actions/actors.rb b/lib/flipper/api/v1/actions/actors.rb
index 6aa179b11..298cb4f2f 100644
--- a/lib/flipper/api/v1/actions/actors.rb
+++ b/lib/flipper/api/v1/actions/actors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/actor'
 
diff --git a/lib/flipper/api/v1/actions/actors_gate.rb b/lib/flipper/api/v1/actions/actors_gate.rb
index 0c319a757..082b362dc 100644
--- a/lib/flipper/api/v1/actions/actors_gate.rb
+++ b/lib/flipper/api/v1/actions/actors_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
diff --git a/lib/flipper/api/v1/actions/boolean_gate.rb b/lib/flipper/api/v1/actions/boolean_gate.rb
index 80114ca3f..8e761ace5 100644
--- a/lib/flipper/api/v1/actions/boolean_gate.rb
+++ b/lib/flipper/api/v1/actions/boolean_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
diff --git a/lib/flipper/api/v1/actions/clear_feature.rb b/lib/flipper/api/v1/actions/clear_feature.rb
index 60a1b9499..10077fdaf 100644
--- a/lib/flipper/api/v1/actions/clear_feature.rb
+++ b/lib/flipper/api/v1/actions/clear_feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
diff --git a/lib/flipper/api/v1/actions/feature.rb b/lib/flipper/api/v1/actions/feature.rb
index 46e301032..8aa5fde56 100644
--- a/lib/flipper/api/v1/actions/feature.rb
+++ b/lib/flipper/api/v1/actions/feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
@@ -12,6 +14,7 @@ class Feature < Api::Action
 
           def get
             return json_error_response(:feature_not_found) unless feature_exists?(feature_name)
+
             feature = Decorators::Feature.new(flipper[feature_name])
             json_response(feature.as_json)
           end
diff --git a/lib/flipper/api/v1/actions/features.rb b/lib/flipper/api/v1/actions/features.rb
index b14560fbe..7706ba109 100644
--- a/lib/flipper/api/v1/actions/features.rb
+++ b/lib/flipper/api/v1/actions/features.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
diff --git a/lib/flipper/api/v1/actions/groups_gate.rb b/lib/flipper/api/v1/actions/groups_gate.rb
index ea53a86d4..a81b4aba6 100644
--- a/lib/flipper/api/v1/actions/groups_gate.rb
+++ b/lib/flipper/api/v1/actions/groups_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
diff --git a/lib/flipper/api/v1/actions/percentage_of_actors_gate.rb b/lib/flipper/api/v1/actions/percentage_of_actors_gate.rb
index 66a030f8e..cb0e2e539 100644
--- a/lib/flipper/api/v1/actions/percentage_of_actors_gate.rb
+++ b/lib/flipper/api/v1/actions/percentage_of_actors_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
@@ -33,8 +35,8 @@ def delete
           def percentage
             @percentage ||= begin
               Integer(params['percentage'])
-            rescue ArgumentError, TypeError
-              -1
+                            rescue ArgumentError, TypeError
+                              -1
             end
           end
         end
diff --git a/lib/flipper/api/v1/actions/percentage_of_time_gate.rb b/lib/flipper/api/v1/actions/percentage_of_time_gate.rb
index 4feec4b10..2eae5920c 100644
--- a/lib/flipper/api/v1/actions/percentage_of_time_gate.rb
+++ b/lib/flipper/api/v1/actions/percentage_of_time_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/api/action'
 require 'flipper/api/v1/decorators/feature'
 
@@ -34,8 +36,8 @@ def delete
           def percentage
             @percentage ||= begin
               Integer(params['percentage'])
-            rescue ArgumentError, TypeError
-              -1
+                            rescue ArgumentError, TypeError
+                              -1
             end
           end
         end
diff --git a/lib/flipper/api/v1/decorators/actor.rb b/lib/flipper/api/v1/decorators/actor.rb
index 42bb6e93c..84b124465 100644
--- a/lib/flipper/api/v1/decorators/actor.rb
+++ b/lib/flipper/api/v1/decorators/actor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Api
     module V1
diff --git a/lib/flipper/api/v1/decorators/feature.rb b/lib/flipper/api/v1/decorators/feature.rb
index a1d33031a..8b8137522 100644
--- a/lib/flipper/api/v1/decorators/feature.rb
+++ b/lib/flipper/api/v1/decorators/feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 require 'flipper/api/v1/decorators/gate'
 
diff --git a/lib/flipper/api/v1/decorators/gate.rb b/lib/flipper/api/v1/decorators/gate.rb
index f971e28fa..f0f40a4e1 100644
--- a/lib/flipper/api/v1/decorators/gate.rb
+++ b/lib/flipper/api/v1/decorators/gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Api
     module V1
diff --git a/lib/flipper/cloud.rb b/lib/flipper/cloud.rb
index 235dbf9fb..85ed02b7e 100644
--- a/lib/flipper/cloud.rb
+++ b/lib/flipper/cloud.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "flipper"
 require "flipper/cloud/configuration"
 
diff --git a/lib/flipper/cloud/configuration.rb b/lib/flipper/cloud/configuration.rb
index 6861682d0..3e70350f6 100644
--- a/lib/flipper/cloud/configuration.rb
+++ b/lib/flipper/cloud/configuration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "flipper/adapters/http"
 require "flipper/adapters/memory"
 require "flipper/adapters/sync"
@@ -6,7 +8,7 @@ module Flipper
   module Cloud
     class Configuration
       # The default url should be the one, the only, the website.
-      DEFAULT_URL = "https://www.flippercloud.io/adapter".freeze
+      DEFAULT_URL = "https://www.flippercloud.io/adapter"
 
       # Public: The token corresponding to an environment on flippercloud.io.
       attr_accessor :token
diff --git a/lib/flipper/configuration.rb b/lib/flipper/configuration.rb
index 0bf97d480..c4bed96aa 100644
--- a/lib/flipper/configuration.rb
+++ b/lib/flipper/configuration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   class Configuration
     def initialize
diff --git a/lib/flipper/dsl.rb b/lib/flipper/dsl.rb
index bc3114b08..10ff26896 100644
--- a/lib/flipper/dsl.rb
+++ b/lib/flipper/dsl.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 
 module Flipper
diff --git a/lib/flipper/errors.rb b/lib/flipper/errors.rb
index 939ed3e36..ad4875c9d 100644
--- a/lib/flipper/errors.rb
+++ b/lib/flipper/errors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   # Top level error that all other errors inherit from.
   class Error < StandardError; end
diff --git a/lib/flipper/feature.rb b/lib/flipper/feature.rb
index b11ca149d..3d41848dd 100644
--- a/lib/flipper/feature.rb
+++ b/lib/flipper/feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/errors'
 require 'flipper/type'
 require 'flipper/gate'
@@ -8,7 +10,7 @@ module Flipper
   # rubocop:disable Metrics/ClassLength
   class Feature
     # Private: The name of feature instrumentation events.
-    InstrumentationName = "feature_operation.#{InstrumentationNamespace}".freeze
+    InstrumentationName = "feature_operation.#{InstrumentationNamespace}"
 
     # Public: The name of the feature.
     attr_reader :name
@@ -377,4 +379,5 @@ def instrument(operation)
       end
     end
   end
+  # rubocop:enable Metrics/ClassLength
 end
diff --git a/lib/flipper/feature_check_context.rb b/lib/flipper/feature_check_context.rb
index ed2f660a1..e816f97d6 100644
--- a/lib/flipper/feature_check_context.rb
+++ b/lib/flipper/feature_check_context.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   class FeatureCheckContext
     # Public: The name of the feature.
diff --git a/lib/flipper/gate.rb b/lib/flipper/gate.rb
index da7af2e55..374d13440 100644
--- a/lib/flipper/gate.rb
+++ b/lib/flipper/gate.rb
@@ -1,8 +1,9 @@
+# frozen_string_literal: true
+
 module Flipper
   class Gate
     # Public
-    def initialize(options = {})
-    end
+    def initialize(options = {}); end
 
     # Public: The name of the gate. Implemented in subclass.
     def name
diff --git a/lib/flipper/gate_values.rb b/lib/flipper/gate_values.rb
index 71967244c..f912d1da4 100644
--- a/lib/flipper/gate_values.rb
+++ b/lib/flipper/gate_values.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'set'
 require 'flipper/typecast'
 
diff --git a/lib/flipper/gates/actor.rb b/lib/flipper/gates/actor.rb
index a85985ee8..46d62d346 100644
--- a/lib/flipper/gates/actor.rb
+++ b/lib/flipper/gates/actor.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Gates
     class Actor < Gate
diff --git a/lib/flipper/gates/boolean.rb b/lib/flipper/gates/boolean.rb
index 7aa2a1dc0..4e6c98ae4 100644
--- a/lib/flipper/gates/boolean.rb
+++ b/lib/flipper/gates/boolean.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Gates
     class Boolean < Gate
diff --git a/lib/flipper/gates/group.rb b/lib/flipper/gates/group.rb
index 1ea9d0b5b..e6a430b10 100644
--- a/lib/flipper/gates/group.rb
+++ b/lib/flipper/gates/group.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Gates
     class Group < Gate
diff --git a/lib/flipper/gates/percentage_of_actors.rb b/lib/flipper/gates/percentage_of_actors.rb
index 76420a0d6..273839b2a 100644
--- a/lib/flipper/gates/percentage_of_actors.rb
+++ b/lib/flipper/gates/percentage_of_actors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'zlib'
 
 module Flipper
diff --git a/lib/flipper/gates/percentage_of_time.rb b/lib/flipper/gates/percentage_of_time.rb
index 47de10aba..b1b6b491a 100644
--- a/lib/flipper/gates/percentage_of_time.rb
+++ b/lib/flipper/gates/percentage_of_time.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Gates
     class PercentageOfTime < Gate
diff --git a/lib/flipper/instrumentation/log_subscriber.rb b/lib/flipper/instrumentation/log_subscriber.rb
index df06252a9..3bff2076b 100644
--- a/lib/flipper/instrumentation/log_subscriber.rb
+++ b/lib/flipper/instrumentation/log_subscriber.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'securerandom'
 require 'active_support/notifications'
 require 'active_support/log_subscriber'
diff --git a/lib/flipper/instrumentation/statsd.rb b/lib/flipper/instrumentation/statsd.rb
index d88cc8137..b82d32a8d 100644
--- a/lib/flipper/instrumentation/statsd.rb
+++ b/lib/flipper/instrumentation/statsd.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'securerandom'
 require 'active_support/notifications'
 require 'flipper/instrumentation/statsd_subscriber'
diff --git a/lib/flipper/instrumentation/statsd_subscriber.rb b/lib/flipper/instrumentation/statsd_subscriber.rb
index b7f73f3fb..0e49d45d9 100644
--- a/lib/flipper/instrumentation/statsd_subscriber.rb
+++ b/lib/flipper/instrumentation/statsd_subscriber.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # Note: You should never need to require this file directly if you are using
 # ActiveSupport::Notifications. Instead, you should require the statsd file
 # that lives in the same directory as this file. The benefit is that it
@@ -12,13 +14,11 @@ class << self
       end
 
       def update_timer(metric)
-        if self.class.client
-          self.class.client.timing metric, (@duration * 1_000).round
-        end
+        self.class.client&.timing metric, (@duration * 1_000).round
       end
 
       def update_counter(metric)
-        self.class.client.increment metric if self.class.client
+        self.class.client&.increment metric
       end
     end
   end
diff --git a/lib/flipper/instrumentation/subscriber.rb b/lib/flipper/instrumentation/subscriber.rb
index 3721a500c..b3844d92f 100644
--- a/lib/flipper/instrumentation/subscriber.rb
+++ b/lib/flipper/instrumentation/subscriber.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Instrumentation
     class Subscriber
@@ -72,7 +74,7 @@ def update_adapter_operation_metrics
         update_timer "flipper.adapter.#{adapter_name}.#{operation}"
       end
 
-      QUESTION_MARK = '?'.freeze
+      QUESTION_MARK = '?'
 
       # Private
       def strip_trailing_question_mark(operation)
diff --git a/lib/flipper/instrumenters/memory.rb b/lib/flipper/instrumenters/memory.rb
index f9c2882c6..46e27153a 100644
--- a/lib/flipper/instrumenters/memory.rb
+++ b/lib/flipper/instrumenters/memory.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Instrumenters
     # Instrumentor that is useful for tests as it stores each of the events that
diff --git a/lib/flipper/instrumenters/noop.rb b/lib/flipper/instrumenters/noop.rb
index cd252431a..c5a0d0557 100644
--- a/lib/flipper/instrumenters/noop.rb
+++ b/lib/flipper/instrumenters/noop.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Instrumenters
     class Noop
diff --git a/lib/flipper/metadata.rb b/lib/flipper/metadata.rb
index 88df56e82..12c6f8463 100644
--- a/lib/flipper/metadata.rb
+++ b/lib/flipper/metadata.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   METADATA = {
     'changelog_uri' => 'https://github.com/jnunemaker/flipper/blob/master/Changelog.md',
diff --git a/lib/flipper/middleware/memoizer.rb b/lib/flipper/middleware/memoizer.rb
index af5395138..6134419ce 100644
--- a/lib/flipper/middleware/memoizer.rb
+++ b/lib/flipper/middleware/memoizer.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Middleware
     class Memoizer
@@ -44,7 +46,7 @@ def call(env)
       private
 
       def skip_memoize?(request)
-        @opts[:unless] && @opts[:unless].call(request)
+        @opts[:unless]&.call(request)
       end
 
       def memoized_call(env)
diff --git a/lib/flipper/middleware/setup_env.rb b/lib/flipper/middleware/setup_env.rb
index f776b35ee..bcfd7e79d 100644
--- a/lib/flipper/middleware/setup_env.rb
+++ b/lib/flipper/middleware/setup_env.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Middleware
     class SetupEnv
diff --git a/lib/flipper/registry.rb b/lib/flipper/registry.rb
index 4eb0c3165..91620d303 100644
--- a/lib/flipper/registry.rb
+++ b/lib/flipper/registry.rb
@@ -1,4 +1,4 @@
-require 'thread'
+# frozen_string_literal: true
 
 module Flipper
   # Internal: Used to store registry of groups by name.
diff --git a/lib/flipper/spec/shared_adapter_specs.rb b/lib/flipper/spec/shared_adapter_specs.rb
index 2f3c7732a..88e58af1f 100644
--- a/lib/flipper/spec/shared_adapter_specs.rb
+++ b/lib/flipper/spec/shared_adapter_specs.rb
@@ -1,6 +1,7 @@
+# frozen_string_literal: true
+
 # Requires the following methods:
 # * subject - The instance of the adapter
-# rubocop:disable Metrics/BlockLength
 RSpec.shared_examples_for 'a flipper adapter' do
   let(:flipper) { Flipper.new(subject) }
   let(:feature) { flipper[:stats] }
@@ -265,7 +266,7 @@
     flipper.disable(:search)
 
     result = subject.get_all
-    expect(result.keys.sort).to eq(%w(search stats))
+    expect(result.keys.sort).to eq(%w[search stats])
   end
 
   it 'can double enable an actor without error' do
diff --git a/lib/flipper/test/shared_adapter_test.rb b/lib/flipper/test/shared_adapter_test.rb
index 4d7327b3c..92432070d 100644
--- a/lib/flipper/test/shared_adapter_test.rb
+++ b/lib/flipper/test/shared_adapter_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # rubocop:disable Metrics/ModuleLength
 module Flipper
   module Test
@@ -260,7 +262,7 @@ def test_includes_explicitly_disabled_features_when_getting_all_features
         @flipper.disable(:search)
 
         result = @adapter.get_all
-        assert_equal %w(search stats), result.keys.sort
+        assert_equal %w[search stats], result.keys.sort
       end
 
       def test_can_double_enable_an_actor_without_error
diff --git a/lib/flipper/type.rb b/lib/flipper/type.rb
index 3cd736801..501566cf1 100644
--- a/lib/flipper/type.rb
+++ b/lib/flipper/type.rb
@@ -1,8 +1,11 @@
+# frozen_string_literal: true
+
 module Flipper
   # Internal: Root class for all flipper types. You should never need to use this.
   class Type
     def self.wrap(value_or_instance)
       return value_or_instance if value_or_instance.is_a?(self)
+
       new(value_or_instance)
     end
 
diff --git a/lib/flipper/typecast.rb b/lib/flipper/typecast.rb
index ec1689857..05bdc12af 100644
--- a/lib/flipper/typecast.rb
+++ b/lib/flipper/typecast.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require 'set'
 
 module Flipper
   module Typecast
     TruthMap = {
-      true    => true,
-      1       => true,
-      'true'  => true,
-      '1'     => true,
+      true => true,
+      1 => true,
+      'true' => true,
+      '1' => true,
     }.freeze
 
     # Internal: Convert value to a boolean.
@@ -45,7 +47,7 @@ def self.to_float(value)
     # Returns a Integer or Float representation of the value.
     # Raises ArgumentError if conversion is not possible.
     def self.to_percentage(value)
-      if value.to_s.include?('.'.freeze)
+      if value.to_s.include?('.')
         to_float(value)
       else
         to_integer(value)
diff --git a/lib/flipper/types/actor.rb b/lib/flipper/types/actor.rb
index e1f10e033..ac1fa853d 100644
--- a/lib/flipper/types/actor.rb
+++ b/lib/flipper/types/actor.rb
@@ -1,8 +1,11 @@
+# frozen_string_literal: true
+
 module Flipper
   module Types
     class Actor < Type
       def self.wrappable?(thing)
         return false if thing.nil?
+
         thing.respond_to?(:flipper_id)
       end
 
diff --git a/lib/flipper/types/boolean.rb b/lib/flipper/types/boolean.rb
index 925559ad2..a8b0e1347 100644
--- a/lib/flipper/types/boolean.rb
+++ b/lib/flipper/types/boolean.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/typecast'
 
 module Flipper
diff --git a/lib/flipper/types/group.rb b/lib/flipper/types/group.rb
index 121f4696b..37824128b 100644
--- a/lib/flipper/types/group.rb
+++ b/lib/flipper/types/group.rb
@@ -1,8 +1,11 @@
+# frozen_string_literal: true
+
 module Flipper
   module Types
     class Group < Type
       def self.wrap(group_or_name)
         return group_or_name if group_or_name.is_a?(self)
+
         Flipper.group(group_or_name)
       end
 
diff --git a/lib/flipper/types/percentage.rb b/lib/flipper/types/percentage.rb
index faaaba997..da28e57a8 100644
--- a/lib/flipper/types/percentage.rb
+++ b/lib/flipper/types/percentage.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/typecast'
 
 module Flipper
diff --git a/lib/flipper/types/percentage_of_actors.rb b/lib/flipper/types/percentage_of_actors.rb
index ccf3c22bc..f134cecd1 100644
--- a/lib/flipper/types/percentage_of_actors.rb
+++ b/lib/flipper/types/percentage_of_actors.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Types
     class PercentageOfActors < Percentage
diff --git a/lib/flipper/types/percentage_of_time.rb b/lib/flipper/types/percentage_of_time.rb
index 3a4cb1933..0cd466396 100644
--- a/lib/flipper/types/percentage_of_time.rb
+++ b/lib/flipper/types/percentage_of_time.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module Types
     class PercentageOfTime < Percentage
diff --git a/lib/flipper/ui.rb b/lib/flipper/ui.rb
index bf77dd2de..fc900883d 100644
--- a/lib/flipper/ui.rb
+++ b/lib/flipper/ui.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'pathname'
 require 'rack'
 begin
@@ -16,9 +18,9 @@ module Flipper
   module UI
     class << self
       # These three configuration options have been moved to Flipper::UI::Configuration
-      deprecated_configuration_options = %w(application_breadcrumb_href
+      deprecated_configuration_options = %w[application_breadcrumb_href
                                             feature_creation_enabled
-                                            feature_removal_enabled)
+                                            feature_removal_enabled]
       deprecated_configuration_options.each do |attribute_name|
         send(:define_method, "#{attribute_name}=".to_sym) do
           raise ConfigurationDeprecated, "The UI configuration for #{attribute_name} has " \
@@ -42,7 +44,7 @@ def self.root
     def self.app(flipper = nil, options = {})
       env_key = options.fetch(:env_key, 'flipper')
       rack_protection_options = options.fetch(:rack_protection, use: :authenticity_token)
-      app = ->() { [200, { 'Content-Type' => 'text/html' }, ['']] }
+      app = -> { [200, { 'Content-Type' => 'text/html' }, ['']] }
       builder = Rack::Builder.new
       yield builder if block_given?
       builder.use Rack::Protection, rack_protection_options
diff --git a/lib/flipper/ui/action.rb b/lib/flipper/ui/action.rb
index 2ac0f3970..e8b1f9c96 100644
--- a/lib/flipper/ui/action.rb
+++ b/lib/flipper/ui/action.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'forwardable'
 require 'flipper/ui/error'
 require 'erubi'
@@ -18,11 +20,11 @@ def feature_name
 
       extend Forwardable
 
-      VALID_REQUEST_METHOD_NAMES = Set.new([
-                                             'get'.freeze,
-                                             'post'.freeze,
-                                             'put'.freeze,
-                                             'delete'.freeze,
+      VALID_REQUEST_METHOD_NAMES = Set.new(%w[
+                                             get
+                                             post
+                                             put
+                                             delete
                                            ]).freeze
 
       # Public: Call this in subclasses so the action knows its route.
@@ -208,9 +210,9 @@ def view(name)
 
         raise "Template does not exist: #{path}" unless path.exist?
 
-        # rubocop:disable Lint/Eval
+        # rubocop:disable Security/Eval
         eval(Erubi::Engine.new(path.read, escape: true).src)
-        # rubocop:enable Lint/Eval
+        # rubocop:enable Security/Eval
       end
 
       # Internal: The path the app is mounted at.
diff --git a/lib/flipper/ui/action_collection.rb b/lib/flipper/ui/action_collection.rb
index f4f86d679..5f94981f4 100644
--- a/lib/flipper/ui/action_collection.rb
+++ b/lib/flipper/ui/action_collection.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module UI
     # Internal: Used to detect the action that should be used in the middleware.
diff --git a/lib/flipper/ui/actions/actors_gate.rb b/lib/flipper/ui/actions/actors_gate.rb
index 2344a8fa8..55db83ae1 100644
--- a/lib/flipper/ui/actions/actors_gate.rb
+++ b/lib/flipper/ui/actions/actors_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 require 'flipper/ui/util'
diff --git a/lib/flipper/ui/actions/add_feature.rb b/lib/flipper/ui/actions/add_feature.rb
index bd22f1a00..7f81ed9fc 100644
--- a/lib/flipper/ui/actions/add_feature.rb
+++ b/lib/flipper/ui/actions/add_feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
diff --git a/lib/flipper/ui/actions/boolean_gate.rb b/lib/flipper/ui/actions/boolean_gate.rb
index a5e22ac0e..732c1b056 100644
--- a/lib/flipper/ui/actions/boolean_gate.rb
+++ b/lib/flipper/ui/actions/boolean_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
diff --git a/lib/flipper/ui/actions/feature.rb b/lib/flipper/ui/actions/feature.rb
index ea2b0876c..654d0856d 100644
--- a/lib/flipper/ui/actions/feature.rb
+++ b/lib/flipper/ui/actions/feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
diff --git a/lib/flipper/ui/actions/features.rb b/lib/flipper/ui/actions/features.rb
index be5aa38ca..9c2953cbd 100644
--- a/lib/flipper/ui/actions/features.rb
+++ b/lib/flipper/ui/actions/features.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 require 'flipper/ui/util'
diff --git a/lib/flipper/ui/actions/file.rb b/lib/flipper/ui/actions/file.rb
index 173b5b424..904f004af 100644
--- a/lib/flipper/ui/actions/file.rb
+++ b/lib/flipper/ui/actions/file.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rack/file'
 require 'flipper/ui/action'
 
diff --git a/lib/flipper/ui/actions/groups_gate.rb b/lib/flipper/ui/actions/groups_gate.rb
index 2de569cc7..10c4aed1a 100644
--- a/lib/flipper/ui/actions/groups_gate.rb
+++ b/lib/flipper/ui/actions/groups_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
diff --git a/lib/flipper/ui/actions/home.rb b/lib/flipper/ui/actions/home.rb
index ea2b7a769..abc2c7670 100644
--- a/lib/flipper/ui/actions/home.rb
+++ b/lib/flipper/ui/actions/home.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
diff --git a/lib/flipper/ui/actions/percentage_of_actors_gate.rb b/lib/flipper/ui/actions/percentage_of_actors_gate.rb
index 89f166bdd..44f396914 100644
--- a/lib/flipper/ui/actions/percentage_of_actors_gate.rb
+++ b/lib/flipper/ui/actions/percentage_of_actors_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
@@ -15,8 +17,8 @@ def post
 
           begin
             feature.enable_percentage_of_actors params['value']
-          rescue ArgumentError => exception
-            error = Rack::Utils.escape("Invalid percentage of actors value: #{exception.message}")
+          rescue ArgumentError => e
+            error = Rack::Utils.escape("Invalid percentage of actors value: #{e.message}")
             redirect_to("/features/#{@feature.key}?error=#{error}")
           end
 
diff --git a/lib/flipper/ui/actions/percentage_of_time_gate.rb b/lib/flipper/ui/actions/percentage_of_time_gate.rb
index bf4ff6e1d..cf2296935 100644
--- a/lib/flipper/ui/actions/percentage_of_time_gate.rb
+++ b/lib/flipper/ui/actions/percentage_of_time_gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/action'
 require 'flipper/ui/decorators/feature'
 
@@ -15,8 +17,8 @@ def post
 
           begin
             feature.enable_percentage_of_time params['value']
-          rescue ArgumentError => exception
-            error = Rack::Utils.escape("Invalid percentage of time value: #{exception.message}")
+          rescue ArgumentError => e
+            error = Rack::Utils.escape("Invalid percentage of time value: #{e.message}")
             redirect_to("/features/#{@feature.key}?error=#{error}")
           end
 
diff --git a/lib/flipper/ui/configuration.rb b/lib/flipper/ui/configuration.rb
index d40cee828..624836bea 100644
--- a/lib/flipper/ui/configuration.rb
+++ b/lib/flipper/ui/configuration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper/ui/configuration/option'
 
 module Flipper
@@ -30,7 +32,7 @@ class Configuration
       # won't see a videoclip of Taylor Swift when there aren't any features
       attr_accessor :fun
 
-      VALID_BANNER_CLASS_VALUES = %w(
+      VALID_BANNER_CLASS_VALUES = %w[
         danger
         dark
         info
@@ -39,7 +41,7 @@ class Configuration
         secondary
         success
         warning
-      ).freeze
+      ].freeze
 
       def initialize
         @actors = Option.new("Actors", "Enable actors using the form above.")
diff --git a/lib/flipper/ui/configuration/option.rb b/lib/flipper/ui/configuration/option.rb
index 723a2dc4c..016976ac5 100644
--- a/lib/flipper/ui/configuration/option.rb
+++ b/lib/flipper/ui/configuration/option.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module UI
     class Option
diff --git a/lib/flipper/ui/decorators/feature.rb b/lib/flipper/ui/decorators/feature.rb
index b65da181e..151bacf99 100644
--- a/lib/flipper/ui/decorators/feature.rb
+++ b/lib/flipper/ui/decorators/feature.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 require 'flipper/ui/decorators/gate'
 require 'flipper/ui/util'
diff --git a/lib/flipper/ui/decorators/gate.rb b/lib/flipper/ui/decorators/gate.rb
index 9f02aea0e..784e37821 100644
--- a/lib/flipper/ui/decorators/gate.rb
+++ b/lib/flipper/ui/decorators/gate.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'delegate'
 
 module Flipper
diff --git a/lib/flipper/ui/error.rb b/lib/flipper/ui/error.rb
index ae1e3aab9..5ad2e5950 100644
--- a/lib/flipper/ui/error.rb
+++ b/lib/flipper/ui/error.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
   module UI
     # All flipper ui errors inherit from this.
diff --git a/lib/flipper/ui/middleware.rb b/lib/flipper/ui/middleware.rb
index 431855d76..c6a6436d4 100644
--- a/lib/flipper/ui/middleware.rb
+++ b/lib/flipper/ui/middleware.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rack'
 require 'flipper/ui/action_collection'
 
diff --git a/lib/flipper/ui/util.rb b/lib/flipper/ui/util.rb
index 1f940aceb..288c49442 100644
--- a/lib/flipper/ui/util.rb
+++ b/lib/flipper/ui/util.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 module Flipper
   module UI
     module Util
       # Private: 0x3000: fullwidth whitespace
-      NON_WHITESPACE_REGEXP = /[^\s#{[0x3000].pack("U")}]/
+      NON_WHITESPACE_REGEXP = /[^\s#{[0x3000].pack("U")}]/.freeze
 
       def self.blank?(str)
         str.to_s !~ NON_WHITESPACE_REGEXP
diff --git a/lib/flipper/version.rb b/lib/flipper/version.rb
index 47f8f6f6c..1e3d461f7 100644
--- a/lib/flipper/version.rb
+++ b/lib/flipper/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module Flipper
-  VERSION = '0.16.2'.freeze
+  VERSION = '0.16.2'
 end
diff --git a/lib/generators/flipper/active_record_generator.rb b/lib/generators/flipper/active_record_generator.rb
index 13751e0f2..282af3cf7 100644
--- a/lib/generators/flipper/active_record_generator.rb
+++ b/lib/generators/flipper/active_record_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rails/generators/active_record'
 
 module Flipper
diff --git a/lib/generators/flipper/templates/sequel_migration.rb b/lib/generators/flipper/templates/sequel_migration.rb
index 0a782a358..2f4ba7586 100644
--- a/lib/generators/flipper/templates/sequel_migration.rb
+++ b/lib/generators/flipper/templates/sequel_migration.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class CreateFlipperTablesSequel < Sequel::Migration
   def up
     create_table :flipper_features do |_t|
diff --git a/script/console b/script/console
index f54a604fb..5945a191b 100755
--- a/script/console
+++ b/script/console
@@ -1,4 +1,5 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
 require "bundler/setup"
 require "flipper"
diff --git a/spec/flipper/actor_spec.rb b/spec/flipper/actor_spec.rb
index 230340e75..4a6629a91 100644
--- a/spec/flipper/actor_spec.rb
+++ b/spec/flipper/actor_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Actor do
diff --git a/spec/flipper/adapter_spec.rb b/spec/flipper/adapter_spec.rb
index 1eec522bb..e0a500bf5 100644
--- a/spec/flipper/adapter_spec.rb
+++ b/spec/flipper/adapter_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Adapter do
@@ -16,7 +18,7 @@
   describe '.default_config' do
     it 'returns default config' do
       adapter_class = Class.new do
-        include Flipper::Adapter # rubocop:disable RSpec/DescribedClass
+        include Flipper::Adapter
       end
       expect(adapter_class.default_config).to eq(default_config)
     end
@@ -25,7 +27,7 @@
   describe '#default_config' do
     it 'returns default config' do
       adapter_class = Class.new do
-        include Flipper::Adapter # rubocop:disable RSpec/DescribedClass
+        include Flipper::Adapter
       end
       expect(adapter_class.new.default_config).to eq(default_config)
     end
@@ -41,7 +43,7 @@
       source_flipper.enable(:search)
       destination_flipper.import(source_flipper)
       expect(destination_flipper[:search].boolean_value).to eq(true)
-      expect(destination_flipper.features.map(&:key).sort).to eq(%w(search))
+      expect(destination_flipper.features.map(&:key).sort).to eq(%w[search])
     end
 
     it 'can import features that have been added but their state is off' do
diff --git a/spec/flipper/adapters/active_record_spec.rb b/spec/flipper/adapters/active_record_spec.rb
index 0742168dc..f11b2609f 100644
--- a/spec/flipper/adapters/active_record_spec.rb
+++ b/spec/flipper/adapters/active_record_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/active_record'
 require 'flipper/spec/shared_adapter_specs'
@@ -13,7 +15,7 @@
                                             database: ':memory:')
   end
 
-  before(:each) do
+  before do
     ActiveRecord::Base.connection.execute <<-SQL
       CREATE TABLE flipper_features (
         id integer PRIMARY KEY,
@@ -39,10 +41,10 @@
     SQL
   end
 
-  after(:each) do
+  after do
     ActiveRecord::Base.connection.execute("DROP table IF EXISTS `flipper_features`")
     ActiveRecord::Base.connection.execute("DROP table IF EXISTS `flipper_gates`")
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 end
diff --git a/spec/flipper/adapters/active_support_cache_store_spec.rb b/spec/flipper/adapters/active_support_cache_store_spec.rb
index 37a765dd9..eab87c852 100644
--- a/spec/flipper/adapters/active_support_cache_store_spec.rb
+++ b/spec/flipper/adapters/active_support_cache_store_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'active_support/cache'
 require 'active_support/cache/dalli_store'
@@ -6,6 +8,8 @@
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::ActiveSupportCacheStore do
+  subject { adapter }
+
   let(:memory_adapter) do
     Flipper::Adapters::OperationLogger.new(Flipper::Adapters::Memory.new)
   end
@@ -13,13 +17,11 @@
   let(:adapter) { described_class.new(memory_adapter, cache, expires_in: 10.seconds) }
   let(:flipper) { Flipper.new(adapter) }
 
-  subject { adapter }
-
   before do
     cache.clear
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   describe '#remove' do
     it 'expires feature' do
diff --git a/spec/flipper/adapters/dalli_spec.rb b/spec/flipper/adapters/dalli_spec.rb
index d4439c96e..0d8c80012 100644
--- a/spec/flipper/adapters/dalli_spec.rb
+++ b/spec/flipper/adapters/dalli_spec.rb
@@ -1,9 +1,13 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/operation_logger'
 require 'flipper/adapters/dalli'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::Dalli do
+  subject { adapter }
+
   let(:memory_adapter) do
     Flipper::Adapters::OperationLogger.new(Flipper::Adapters::Memory.new)
   end
@@ -11,13 +15,11 @@
   let(:adapter) { described_class.new(memory_adapter, cache) }
   let(:flipper) { Flipper.new(adapter) }
 
-  subject { adapter }
-
   before do
     cache.flush
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   describe '#remove' do
     it 'expires feature' do
diff --git a/spec/flipper/adapters/http_spec.rb b/spec/flipper/adapters/http_spec.rb
index 2be4387ca..c71976a96 100644
--- a/spec/flipper/adapters/http_spec.rb
+++ b/spec/flipper/adapters/http_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/http'
 require 'flipper/adapters/pstore'
@@ -37,14 +39,14 @@
     end
 
     after :all do
-      @server.shutdown if @server
+      @server&.shutdown
     end
 
-    before(:each) do
+    before do
       @pstore_file.unlink if @pstore_file.exist?
     end
 
-    it_should_behave_like 'a flipper adapter'
+    it_behaves_like 'a flipper adapter'
 
     it "can enable and disable unregistered group" do
       flipper = Flipper.new(subject)
@@ -119,6 +121,8 @@
   end
 
   describe 'configuration' do
+    subject { described_class.new(options) }
+
     let(:debug_output) { object_double($stderr) }
     let(:options) do
       {
@@ -132,7 +136,7 @@
         debug_output: debug_output,
       }
     end
-    subject { described_class.new(options) }
+
     let(:feature) { flipper[:feature_panel] }
 
     before do
@@ -151,7 +155,7 @@
       subject.get(feature)
       expect(
         a_request(:get, 'http://app.com/mount-point/features/feature_panel')
-        .with(basic_auth: %w(username password))
+        .with(basic_auth: %w[username password])
       ).to have_been_made.once
     end
 
@@ -165,7 +169,7 @@
   end
 
   def fixture_file(name)
-    fixtures_path = File.expand_path('../../../fixtures', __FILE__)
+    fixtures_path = File.expand_path('../../fixtures', __dir__)
     File.new(fixtures_path + '/' + name)
   end
 end
diff --git a/spec/flipper/adapters/instrumented_spec.rb b/spec/flipper/adapters/instrumented_spec.rb
index 2b9a8fdcc..cecc334f1 100644
--- a/spec/flipper/adapters/instrumented_spec.rb
+++ b/spec/flipper/adapters/instrumented_spec.rb
@@ -1,9 +1,15 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/instrumented'
 require 'flipper/instrumenters/memory'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::Instrumented do
+  subject do
+    described_class.new(adapter, instrumenter: instrumenter)
+  end
+
   let(:instrumenter) { Flipper::Instrumenters::Memory.new }
   let(:adapter) { Flipper::Adapters::Memory.new }
   let(:flipper) { Flipper.new(adapter) }
@@ -12,11 +18,7 @@
   let(:gate) { feature.gate(:percentage_of_actors) }
   let(:thing) { flipper.actors(22) }
 
-  subject do
-    described_class.new(adapter, instrumenter: instrumenter)
-  end
-
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   it 'forwards missing methods to underlying adapter' do
     adapter = Class.new do
diff --git a/spec/flipper/adapters/memoizable_spec.rb b/spec/flipper/adapters/memoizable_spec.rb
index 121f83b3a..0ce9632bc 100644
--- a/spec/flipper/adapters/memoizable_spec.rb
+++ b/spec/flipper/adapters/memoizable_spec.rb
@@ -1,17 +1,19 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/memoizable'
 require 'flipper/adapters/operation_logger'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::Memoizable do
+  subject { described_class.new(adapter, cache) }
+
   let(:features_key) { described_class::FeaturesKey }
   let(:adapter) { Flipper::Adapters::Memory.new }
   let(:flipper) { Flipper.new(adapter) }
   let(:cache)   { {} }
 
-  subject { described_class.new(adapter, cache) }
-
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   it 'forwards missing methods to underlying adapter' do
     adapter = Class.new do
@@ -91,7 +93,7 @@ def foo
       end
 
       it 'memoizes features' do
-        names = %i(stats shiny)
+        names = [:stats, :shiny]
         features = names.map { |name| flipper[name] }
         results = subject.get_multi(features)
         features.each do |feature|
@@ -107,7 +109,7 @@ def foo
       end
 
       it 'returns result' do
-        names = %i(stats shiny)
+        names = [:stats, :shiny]
         features = names.map { |name| flipper[name] }
         result = subject.get_multi(features)
         adapter_result = adapter.get_multi(features)
@@ -123,7 +125,7 @@ def foo
       end
 
       it 'memoizes features' do
-        names = %i(stats shiny)
+        names = [:stats, :shiny]
         features = names.map { |name| flipper[name].tap(&:enable) }
         results = subject.get_all
         features.each do |feature|
@@ -161,7 +163,7 @@ def foo
       end
 
       it 'returns result' do
-        names = %i(stats shiny)
+        names = [:stats, :shiny]
         names.map { |name| flipper[name].tap(&:enable) }
         result = subject.get_all
         adapter_result = adapter.get_all
diff --git a/spec/flipper/adapters/memory_spec.rb b/spec/flipper/adapters/memory_spec.rb
index 62a3a594a..847b3ab05 100644
--- a/spec/flipper/adapters/memory_spec.rb
+++ b/spec/flipper/adapters/memory_spec.rb
@@ -1,8 +1,10 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::Memory do
   subject { described_class.new }
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 end
diff --git a/spec/flipper/adapters/moneta_spec.rb b/spec/flipper/adapters/moneta_spec.rb
index 368254812..fca7bee76 100644
--- a/spec/flipper/adapters/moneta_spec.rb
+++ b/spec/flipper/adapters/moneta_spec.rb
@@ -1,10 +1,13 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/moneta'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::Moneta do
-  let(:moneta) { Moneta.new(:Memory) }
   subject { described_class.new(moneta) }
 
-  it_should_behave_like 'a flipper adapter'
+  let(:moneta) { Moneta.new(:Memory) }
+
+  it_behaves_like 'a flipper adapter'
 end
diff --git a/spec/flipper/adapters/mongo_spec.rb b/spec/flipper/adapters/mongo_spec.rb
index bb6934b9a..58d9bf89e 100644
--- a/spec/flipper/adapters/mongo_spec.rb
+++ b/spec/flipper/adapters/mongo_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/mongo'
 require 'flipper/spec/shared_adapter_specs'
@@ -23,5 +25,5 @@
     collection.create
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 end
diff --git a/spec/flipper/adapters/operation_logger_spec.rb b/spec/flipper/adapters/operation_logger_spec.rb
index 5eec8f1a6..e468a1de8 100644
--- a/spec/flipper/adapters/operation_logger_spec.rb
+++ b/spec/flipper/adapters/operation_logger_spec.rb
@@ -1,15 +1,17 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/operation_logger'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::OperationLogger do
+  subject { described_class.new(adapter, operations) }
+
   let(:operations) { [] }
   let(:adapter)    { Flipper::Adapters::Memory.new }
   let(:flipper)    { Flipper.new(adapter) }
 
-  subject { described_class.new(adapter, operations) }
-
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   it 'forwards missing methods to underlying adapter' do
     adapter = Class.new do
diff --git a/spec/flipper/adapters/pstore_spec.rb b/spec/flipper/adapters/pstore_spec.rb
index 2ccf9993e..bdeae19c5 100644
--- a/spec/flipper/adapters/pstore_spec.rb
+++ b/spec/flipper/adapters/pstore_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/pstore'
 require 'flipper/spec/shared_adapter_specs'
@@ -10,7 +12,7 @@
     described_class.new(pstore_file)
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   it 'defaults path to flipper.pstore' do
     expect(described_class.new.path).to eq('flipper.pstore')
diff --git a/spec/flipper/adapters/read_only_spec.rb b/spec/flipper/adapters/read_only_spec.rb
index 12caa81bb..f384c3239 100644
--- a/spec/flipper/adapters/read_only_spec.rb
+++ b/spec/flipper/adapters/read_only_spec.rb
@@ -1,7 +1,11 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/read_only'
 
 RSpec.describe Flipper::Adapters::ReadOnly do
+  subject { described_class.new(adapter) }
+
   let(:adapter) { Flipper::Adapters::Memory.new }
   let(:flipper) { Flipper.new(subject) }
   let(:feature) { flipper[:stats] }
@@ -12,8 +16,6 @@
   let(:actors_gate)  { feature.gate(:percentage_of_actors) }
   let(:time_gate)    { feature.gate(:percentage_of_time) }
 
-  subject { described_class.new(adapter) }
-
   before do
     Flipper.register(:admins) do |actor|
       actor.respond_to?(:admin?) && actor.admin?
diff --git a/spec/flipper/adapters/redis_cache_spec.rb b/spec/flipper/adapters/redis_cache_spec.rb
index f1618a981..586a098c0 100644
--- a/spec/flipper/adapters/redis_cache_spec.rb
+++ b/spec/flipper/adapters/redis_cache_spec.rb
@@ -1,9 +1,13 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/operation_logger'
 require 'flipper/adapters/redis_cache'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::RedisCache do
+  subject { adapter }
+
   let(:client) do
     options = {}
     options[:url] = ENV['REDIS_URL'] if ENV['REDIS_URL']
@@ -16,13 +20,11 @@
   let(:adapter) { described_class.new(memory_adapter, client) }
   let(:flipper) { Flipper.new(adapter) }
 
-  subject { adapter }
-
   before do
     client.flushdb
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   describe '#remove' do
     it 'expires feature' do
diff --git a/spec/flipper/adapters/redis_spec.rb b/spec/flipper/adapters/redis_spec.rb
index 9ed6d5c83..8cca0e344 100644
--- a/spec/flipper/adapters/redis_spec.rb
+++ b/spec/flipper/adapters/redis_spec.rb
@@ -1,8 +1,12 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/redis'
 require 'flipper/spec/shared_adapter_specs'
 
 RSpec.describe Flipper::Adapters::Redis do
+  subject { described_class.new(client) }
+
   let(:client) do
     options = {}
 
@@ -11,11 +15,9 @@
     Redis.new(options)
   end
 
-  subject { described_class.new(client) }
-
   before do
     client.flushdb
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 end
diff --git a/spec/flipper/adapters/rollout_spec.rb b/spec/flipper/adapters/rollout_spec.rb
index 003e850b5..07bf04c4e 100644
--- a/spec/flipper/adapters/rollout_spec.rb
+++ b/spec/flipper/adapters/rollout_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'redis'
 require 'rollout'
diff --git a/spec/flipper/adapters/sequel_spec.rb b/spec/flipper/adapters/sequel_spec.rb
index 7463450eb..634049cce 100644
--- a/spec/flipper/adapters/sequel_spec.rb
+++ b/spec/flipper/adapters/sequel_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'sequel'
 
@@ -17,15 +19,15 @@
   let(:feature_class) { Flipper::Adapters::Sequel::Feature }
   let(:gate_class) { Flipper::Adapters::Sequel::Gate }
 
-  before(:each) do
+  before do
     CreateFlipperTablesSequel.new(Sequel::Model.db).up
     feature_class.dataset = feature_class.dataset
     gate_class.dataset = gate_class.dataset
   end
 
-  after(:each) do
+  after do
     CreateFlipperTablesSequel.new(Sequel::Model.db).down
   end
 
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 end
diff --git a/spec/flipper/adapters/sync/feature_synchronizer_spec.rb b/spec/flipper/adapters/sync/feature_synchronizer_spec.rb
index c474acbdf..1d651aac7 100644
--- a/spec/flipper/adapters/sync/feature_synchronizer_spec.rb
+++ b/spec/flipper/adapters/sync/feature_synchronizer_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "helper"
 require "flipper/adapters/memory"
 require "flipper/adapters/operation_logger"
diff --git a/spec/flipper/adapters/sync/interval_synchronizer_spec.rb b/spec/flipper/adapters/sync/interval_synchronizer_spec.rb
index 5c8c3324a..a2ab053f5 100644
--- a/spec/flipper/adapters/sync/interval_synchronizer_spec.rb
+++ b/spec/flipper/adapters/sync/interval_synchronizer_spec.rb
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 require "helper"
 require "flipper/adapters/sync/interval_synchronizer"
 
 RSpec.describe Flipper::Adapters::Sync::IntervalSynchronizer do
+  subject { described_class.new(synchronizer, interval: interval) }
+
   let(:events) { [] }
   let(:synchronizer) { -> { events << described_class.now } }
   let(:interval) { 10 }
 
-  subject { described_class.new(synchronizer, interval: interval) }
-
   it 'synchronizes on first call' do
     expect(events.size).to be(0)
     subject.call
diff --git a/spec/flipper/adapters/sync/synchronizer_spec.rb b/spec/flipper/adapters/sync/synchronizer_spec.rb
index ba51a0ad1..2fa89efd3 100644
--- a/spec/flipper/adapters/sync/synchronizer_spec.rb
+++ b/spec/flipper/adapters/sync/synchronizer_spec.rb
@@ -1,17 +1,19 @@
+# frozen_string_literal: true
+
 require "helper"
 require "flipper/adapters/memory"
 require "flipper/instrumenters/memory"
 require "flipper/adapters/sync/synchronizer"
 
 RSpec.describe Flipper::Adapters::Sync::Synchronizer do
+  subject { described_class.new(local, remote, instrumenter: instrumenter) }
+
   let(:local) { Flipper::Adapters::Memory.new }
   let(:remote) { Flipper::Adapters::Memory.new }
   let(:local_flipper) { Flipper.new(local) }
   let(:remote_flipper) { Flipper.new(remote) }
   let(:instrumenter) { Flipper::Instrumenters::Memory.new }
 
-  subject { described_class.new(local, remote, instrumenter: instrumenter) }
-
   it "instruments call" do
     subject.call
     expect(instrumenter.events_by_name("synchronizer_exception.flipper").size).to be(0)
@@ -65,7 +67,7 @@
 
       expect(local_flipper[:search].boolean_value).to eq(true)
       expect(local_flipper[:logging].percentage_of_time_value).to eq(10)
-      expect(local_flipper.features.map(&:key).sort).to eq(%w(logging search))
+      expect(local_flipper.features.map(&:key).sort).to eq(%w[logging search])
     end
 
     it 'adds features in remote that are not in local' do
diff --git a/spec/flipper/adapters/sync_spec.rb b/spec/flipper/adapters/sync_spec.rb
index dd7eed702..ea0803f63 100644
--- a/spec/flipper/adapters/sync_spec.rb
+++ b/spec/flipper/adapters/sync_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/sync'
 require 'flipper/adapters/operation_logger'
@@ -5,6 +7,10 @@
 require 'active_support/notifications'
 
 RSpec.describe Flipper::Adapters::Sync do
+  subject do
+    described_class.new(local_adapter, remote_adapter, interval: 1)
+  end
+
   let(:local_adapter) do
     Flipper::Adapters::OperationLogger.new Flipper::Adapters::Memory.new
   end
@@ -15,42 +21,38 @@
   let(:remote) { Flipper.new(remote_adapter) }
   let(:sync) { Flipper.new(subject) }
 
-  subject do
-    described_class.new(local_adapter, remote_adapter, interval: 1)
-  end
-
-  it_should_behave_like 'a flipper adapter'
+  it_behaves_like 'a flipper adapter'
 
   context 'when local has never been synced' do
     it 'syncs boolean' do
       remote.enable(:search)
       expect(sync[:search].boolean_value).to be(true)
-      expect(subject.features.sort).to eq(%w(search))
+      expect(subject.features.sort).to eq(%w[search])
     end
 
     it 'syncs actor' do
       actor = Flipper::Actor.new("User;1000")
       remote.enable_actor(:search, actor)
       expect(sync[:search].actors_value).to eq(Set[actor.flipper_id])
-      expect(subject.features.sort).to eq(%w(search))
+      expect(subject.features.sort).to eq(%w[search])
     end
 
     it 'syncs group' do
       remote.enable_group(:search, :staff)
       expect(sync[:search].groups_value).to eq(Set["staff"])
-      expect(subject.features.sort).to eq(%w(search))
+      expect(subject.features.sort).to eq(%w[search])
     end
 
     it 'syncs percentage of actors' do
       remote.enable_percentage_of_actors(:search, 25)
       expect(sync[:search].percentage_of_actors_value).to eq(25)
-      expect(subject.features.sort).to eq(%w(search))
+      expect(subject.features.sort).to eq(%w[search])
     end
 
     it 'syncs percentage of time' do
       remote.enable_percentage_of_time(:search, 15)
       expect(sync[:search].percentage_of_time_value).to eq(15)
-      expect(subject.features.sort).to eq(%w(search))
+      expect(subject.features.sort).to eq(%w[search])
     end
   end
 
diff --git a/spec/flipper/api/action_spec.rb b/spec/flipper/api/action_spec.rb
index 4ee974f04..0a87106db 100644
--- a/spec/flipper/api/action_spec.rb
+++ b/spec/flipper/api/action_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::Action do
diff --git a/spec/flipper/api/json_params_spec.rb b/spec/flipper/api/json_params_spec.rb
index 186fdd15d..946e976c8 100644
--- a/spec/flipper/api/json_params_spec.rb
+++ b/spec/flipper/api/json_params_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::JsonParams do
diff --git a/spec/flipper/api/v1/actions/actors_gate_spec.rb b/spec/flipper/api/v1/actions/actors_gate_spec.rb
index dfa35948e..7490a47d8 100644
--- a/spec/flipper/api/v1/actions/actors_gate_spec.rb
+++ b/spec/flipper/api/v1/actions/actors_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::ActorsGate do
@@ -12,7 +14,7 @@
 
     it 'enables feature for actor' do
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(actor)).to be_truthy
+      expect(flipper[:my_feature]).to be_enabled(actor)
       expect(flipper[:my_feature].enabled_gate_names).to eq([:actor])
     end
 
@@ -32,7 +34,7 @@
 
     it 'disables feature' do
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(actor)).to be_falsy
+      expect(flipper[:my_feature]).not_to be_enabled(actor)
       expect(flipper[:my_feature].enabled_gate_names).to be_empty
     end
 
@@ -50,7 +52,7 @@
 
     it 'enables feature for actor' do
       expect(last_response.status).to eq(200)
-      expect(flipper["my/feature"].enabled?(actor)).to be_truthy
+      expect(flipper["my/feature"]).to be_enabled(actor)
       expect(flipper["my/feature"].enabled_gate_names).to eq([:actor])
     end
 
@@ -115,7 +117,7 @@
 
     it 'enables feature for actor' do
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(actor)).to be_truthy
+      expect(flipper[:my_feature]).to be_enabled(actor)
       expect(flipper[:my_feature].enabled_gate_names).to eq([:actor])
     end
 
@@ -132,7 +134,7 @@
 
     it 'disables feature' do
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(actor)).to be_falsy
+      expect(flipper[:my_feature]).not_to be_enabled(actor)
       expect(flipper[:my_feature].enabled_gate_names).to be_empty
     end
 
diff --git a/spec/flipper/api/v1/actions/actors_spec.rb b/spec/flipper/api/v1/actions/actors_spec.rb
index 78346a399..c8b80af1c 100644
--- a/spec/flipper/api/v1/actions/actors_spec.rb
+++ b/spec/flipper/api/v1/actions/actors_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::Actors do
diff --git a/spec/flipper/api/v1/actions/boolean_gate_spec.rb b/spec/flipper/api/v1/actions/boolean_gate_spec.rb
index 71978a87b..467af0cf3 100644
--- a/spec/flipper/api/v1/actions/boolean_gate_spec.rb
+++ b/spec/flipper/api/v1/actions/boolean_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::BooleanGate do
@@ -11,7 +13,7 @@
 
     it 'enables feature' do
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].on?).to be_truthy
+      expect(flipper[:my_feature]).to be_on
     end
 
     it 'returns decorated feature with boolean gate enabled' do
@@ -28,7 +30,7 @@
 
     it 'enables feature' do
       expect(last_response.status).to eq(200)
-      expect(flipper["my/feature"].on?).to be_truthy
+      expect(flipper["my/feature"]).to be_on
     end
 
     it 'returns decorated feature with boolean gate enabled' do
@@ -45,7 +47,7 @@
 
     it 'disables feature' do
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].off?).to be_truthy
+      expect(flipper[:my_feature]).to be_off
     end
 
     it 'returns decorated feature with boolean gate disabled' do
diff --git a/spec/flipper/api/v1/actions/clear_feature_spec.rb b/spec/flipper/api/v1/actions/clear_feature_spec.rb
index bda8f14c4..3d9f686c4 100644
--- a/spec/flipper/api/v1/actions/clear_feature_spec.rb
+++ b/spec/flipper/api/v1/actions/clear_feature_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::ClearFeature do
@@ -20,7 +22,7 @@
 
     it 'clears feature' do
       expect(last_response.status).to eq(204)
-      expect(flipper[:my_feature].off?).to be_truthy
+      expect(flipper[:my_feature]).to be_off
     end
   end
 
@@ -41,7 +43,7 @@
 
     it 'clears feature' do
       expect(last_response.status).to eq(204)
-      expect(flipper["my/feature"].off?).to be_truthy
+      expect(flipper["my/feature"]).to be_off
     end
   end
 end
diff --git a/spec/flipper/api/v1/actions/feature_spec.rb b/spec/flipper/api/v1/actions/feature_spec.rb
index f738ba667..d35467e52 100644
--- a/spec/flipper/api/v1/actions/feature_spec.rb
+++ b/spec/flipper/api/v1/actions/feature_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::Feature do
diff --git a/spec/flipper/api/v1/actions/features_spec.rb b/spec/flipper/api/v1/actions/features_spec.rb
index 8915cac6a..086db46f2 100644
--- a/spec/flipper/api/v1/actions/features_spec.rb
+++ b/spec/flipper/api/v1/actions/features_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::Features do
@@ -66,7 +68,7 @@
       it 'responds with correct attributes' do
         expect(last_response.status).to eq(200)
         keys = json_response.fetch('features').map { |feature| feature.fetch('key') }.sort
-        expect(keys).to eq(%w(search stats))
+        expect(keys).to eq(%w[search stats])
       end
     end
 
@@ -80,7 +82,7 @@
       it 'only returns features that exist' do
         expect(last_response.status).to eq(200)
         keys = json_response.fetch('features').map { |feature| feature.fetch('key') }.sort
-        expect(keys).to eq(%w(search stats))
+        expect(keys).to eq(%w[search stats])
       end
     end
 
@@ -150,7 +152,7 @@
       end
 
       it 'does not enable feature' do
-        expect(flipper['my_feature'].enabled?).to be_falsy
+        expect(flipper['my_feature']).not_to be_enabled
       end
     end
 
diff --git a/spec/flipper/api/v1/actions/groups_gate_spec.rb b/spec/flipper/api/v1/actions/groups_gate_spec.rb
index a330633c7..e7cc8d7e1 100644
--- a/spec/flipper/api/v1/actions/groups_gate_spec.rb
+++ b/spec/flipper/api/v1/actions/groups_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::GroupsGate do
@@ -17,7 +19,7 @@
       allow(person).to receive(:flipper_id).and_return(1)
       allow(person).to receive(:admin?).and_return(true)
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(person)).to be_truthy
+      expect(flipper[:my_feature]).to be_enabled(person)
     end
 
     it 'returns decorated feature with group enabled' do
@@ -40,7 +42,7 @@
       allow(person).to receive(:flipper_id).and_return(1)
       allow(person).to receive(:admin?).and_return(true)
       expect(last_response.status).to eq(200)
-      expect(flipper["my/feature"].enabled?(person)).to be_truthy
+      expect(flipper["my/feature"]).to be_enabled(person)
     end
 
     it 'returns decorated feature with group enabled' do
@@ -87,7 +89,7 @@
       allow(person).to receive(:flipper_id).and_return(1)
       allow(person).to receive(:admin?).and_return(true)
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(person)).to be_falsey
+      expect(flipper[:my_feature]).not_to be_enabled(person)
     end
 
     it 'returns decorated feature with group disabled' do
@@ -109,7 +111,7 @@
       allow(person).to receive(:flipper_id).and_return(1)
       allow(person).to receive(:admin?).and_return(true)
       expect(last_response.status).to eq(200)
-      expect(flipper[:my_feature].enabled?(person)).to be_falsey
+      expect(flipper[:my_feature]).not_to be_enabled(person)
     end
 
     it 'returns decorated feature with group disabled' do
diff --git a/spec/flipper/api/v1/actions/percentage_of_actors_gate_spec.rb b/spec/flipper/api/v1/actions/percentage_of_actors_gate_spec.rb
index f568cce0a..a9e5d827c 100644
--- a/spec/flipper/api/v1/actions/percentage_of_actors_gate_spec.rb
+++ b/spec/flipper/api/v1/actions/percentage_of_actors_gate_spec.rb
@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::PercentageOfActorsGate do
   let(:app) { build_api(flipper) }
 
   describe 'enable' do
-    context 'for feature with slash in name' do
+    context 'with feature with slash in name' do
       before do
         flipper["my/feature"].disable
         post '/features/my/feature/percentage_of_actors', percentage: '10'
diff --git a/spec/flipper/api/v1/actions/percentage_of_time_gate_spec.rb b/spec/flipper/api/v1/actions/percentage_of_time_gate_spec.rb
index 72bb35d5a..9b7377d67 100644
--- a/spec/flipper/api/v1/actions/percentage_of_time_gate_spec.rb
+++ b/spec/flipper/api/v1/actions/percentage_of_time_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api::V1::Actions::PercentageOfTimeGate do
diff --git a/spec/flipper/api_spec.rb b/spec/flipper/api_spec.rb
index e22ffb6ac..2e1165ecf 100644
--- a/spec/flipper/api_spec.rb
+++ b/spec/flipper/api_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Api do
@@ -20,7 +22,7 @@
 
       expect(last_response.status).to eq(200)
       feature_names = json_response.fetch('features').map { |feature| feature.fetch('key') }
-      expect(feature_names).to eq(%w(env_a env_b))
+      expect(feature_names).to eq(%w[env_a env_b])
     end
   end
 
@@ -39,7 +41,7 @@
 
       expect(last_response.status).to eq(200)
       feature_names = json_response.fetch('features').map { |feature| feature.fetch('key') }
-      expect(feature_names).to eq(%w(a b))
+      expect(feature_names).to eq(%w[a b])
     end
   end
 
@@ -63,7 +65,7 @@
 
       expect(last_response.status).to eq(200)
       feature_names = json_response.fetch('features').map { |feature| feature.fetch('key') }
-      expect(feature_names).to eq(%w(a b))
+      expect(feature_names).to eq(%w[a b])
     end
   end
 
diff --git a/spec/flipper/cloud/configuration_spec.rb b/spec/flipper/cloud/configuration_spec.rb
index adc347268..57430c306 100644
--- a/spec/flipper/cloud/configuration_spec.rb
+++ b/spec/flipper/cloud/configuration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/cloud/configuration'
 require 'flipper/adapters/instrumented'
diff --git a/spec/flipper/cloud_spec.rb b/spec/flipper/cloud_spec.rb
index 2af5e6d4d..c760ad370 100644
--- a/spec/flipper/cloud_spec.rb
+++ b/spec/flipper/cloud_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/cloud'
 require 'flipper/adapters/instrumented'
diff --git a/spec/flipper/configuration_spec.rb b/spec/flipper/configuration_spec.rb
index ffc06023f..32293fcb2 100644
--- a/spec/flipper/configuration_spec.rb
+++ b/spec/flipper/configuration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/configuration'
 
diff --git a/spec/flipper/dsl_spec.rb b/spec/flipper/dsl_spec.rb
index 4d98d7e70..98beb3ce3 100644
--- a/spec/flipper/dsl_spec.rb
+++ b/spec/flipper/dsl_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/dsl'
 
@@ -28,7 +30,7 @@
   end
 
   describe '#feature' do
-    it_should_behave_like 'a DSL feature' do
+    it_behaves_like 'a DSL feature' do
       let(:method_name) { :feature }
       let(:instrumenter) { double('Instrumentor', instrument: nil) }
       let(:feature) { dsl.send(method_name, :stats) }
@@ -39,7 +41,7 @@
   describe '#preload' do
     let(:instrumenter) { double('Instrumentor', instrument: nil) }
     let(:dsl) { described_class.new(adapter, instrumenter: instrumenter) }
-    let(:names) { %i(stats shiny) }
+    let(:names) { [:stats, :shiny] }
     let(:features) { dsl.preload(names) }
 
     it 'returns array of features' do
@@ -75,7 +77,7 @@
       names.each { |name| adapter.add subject[name] }
       described_class.new(adapter, instrumenter: instrumenter)
     end
-    let(:names) { %i(stats shiny) }
+    let(:names) { [:stats, :shiny] }
     let(:features) { dsl.preload_all }
 
     it 'returns array of features' do
@@ -106,7 +108,7 @@
   end
 
   describe '#[]' do
-    it_should_behave_like 'a DSL feature' do
+    it_behaves_like 'a DSL feature' do
       let(:method_name) { :[] }
       let(:instrumenter) { double('Instrumentor', instrument: nil) }
       let(:feature) { dsl.send(method_name, :stats) }
@@ -115,19 +117,19 @@
   end
 
   describe '#boolean' do
-    it_should_behave_like 'a DSL boolean method' do
+    it_behaves_like 'a DSL boolean method' do
       let(:method_name) { :boolean }
     end
   end
 
   describe '#bool' do
-    it_should_behave_like 'a DSL boolean method' do
+    it_behaves_like 'a DSL boolean method' do
       let(:method_name) { :bool }
     end
   end
 
   describe '#group' do
-    context 'for registered group' do
+    context 'with registered group' do
       before do
         @group = Flipper.register(:admins) {}
       end
@@ -140,7 +142,7 @@
   end
 
   describe '#actor' do
-    context 'for a thing' do
+    context 'with a thing' do
       it 'returns actor instance' do
         thing = Flipper::Actor.new(33)
         actor = subject.actor(thing)
@@ -149,7 +151,7 @@
       end
     end
 
-    context 'for nil' do
+    context 'with nil' do
       it 'raises argument error' do
         expect do
           subject.actor(nil)
@@ -157,7 +159,7 @@
       end
     end
 
-    context 'for something that is not actor wrappable' do
+    context 'with something that is not actor wrappable' do
       it 'raises argument error' do
         expect do
           subject.actor(Object.new)
@@ -221,7 +223,7 @@
         subject.features.each do |feature|
           expect(feature).to be_instance_of(Flipper::Feature)
         end
-        expect(subject.features.map(&:name).map(&:to_s).sort).to eq(%w(cache search stats))
+        expect(subject.features.map(&:name).map(&:to_s).sort).to eq(%w[cache search stats])
       end
     end
   end
diff --git a/spec/flipper/feature_check_context_spec.rb b/spec/flipper/feature_check_context_spec.rb
index 52dc7f306..18522359f 100644
--- a/spec/flipper/feature_check_context_spec.rb
+++ b/spec/flipper/feature_check_context_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::FeatureCheckContext do
diff --git a/spec/flipper/feature_spec.rb b/spec/flipper/feature_spec.rb
index 77551af56..d3f99bb0b 100644
--- a/spec/flipper/feature_spec.rb
+++ b/spec/flipper/feature_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/feature'
 require 'flipper/instrumenters/memory'
@@ -142,12 +144,12 @@
   end
 
   describe 'instrumentation' do
-    let(:instrumenter) { Flipper::Instrumenters::Memory.new }
-
     subject do
       described_class.new(:search, adapter, instrumenter: instrumenter)
     end
 
+    let(:instrumenter) { Flipper::Instrumenters::Memory.new }
+
     it 'is recorded for enable' do
       thing = Flipper::Types::Actor.new(Flipper::Actor.new('1'))
       gate = subject.gate_for(thing)
diff --git a/spec/flipper/gate_spec.rb b/spec/flipper/gate_spec.rb
index 364d8e148..38383519a 100644
--- a/spec/flipper/gate_spec.rb
+++ b/spec/flipper/gate_spec.rb
@@ -1,14 +1,20 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Gate do
-  let(:feature_name) { :stats }
-
   subject do
     described_class.new
   end
 
+  let(:feature_name) { :stats }
+
   describe '#inspect' do
-    context 'for subclass' do
+    context 'with subclass' do
+      subject do
+        subclass.new
+      end
+
       let(:subclass) do
         Class.new(described_class) do
           def name
@@ -25,10 +31,6 @@ def data_type
         end
       end
 
-      subject do
-        subclass.new
-      end
-
       it 'includes attributes' do
         string = subject.inspect
         expect(string).to include(subject.object_id.to_s)
diff --git a/spec/flipper/gate_values_spec.rb b/spec/flipper/gate_values_spec.rb
index 5aab8c70e..23fc43274 100644
--- a/spec/flipper/gate_values_spec.rb
+++ b/spec/flipper/gate_values_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/gate_values'
 
diff --git a/spec/flipper/gates/actor_spec.rb b/spec/flipper/gates/actor_spec.rb
index ea6669572..3836a0bed 100644
--- a/spec/flipper/gates/actor_spec.rb
+++ b/spec/flipper/gates/actor_spec.rb
@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Gates::Actor do
-  let(:feature_name) { :search }
-
   subject do
     described_class.new
   end
+
+  let(:feature_name) { :search }
 end
diff --git a/spec/flipper/gates/boolean_spec.rb b/spec/flipper/gates/boolean_spec.rb
index cf9545e6a..9ac6121cf 100644
--- a/spec/flipper/gates/boolean_spec.rb
+++ b/spec/flipper/gates/boolean_spec.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Gates::Boolean do
-  let(:feature_name) { :search }
-
   subject do
     described_class.new
   end
 
+  let(:feature_name) { :search }
+
   def context(bool)
     Flipper::FeatureCheckContext.new(
       feature_name: feature_name,
@@ -16,13 +18,13 @@ def context(bool)
   end
 
   describe '#enabled?' do
-    context 'for true value' do
+    context 'with true value' do
       it 'returns true' do
         expect(subject.enabled?(true)).to eq(true)
       end
     end
 
-    context 'for false value' do
+    context 'with false value' do
       it 'returns false' do
         expect(subject.enabled?(false)).to eq(false)
       end
@@ -30,13 +32,13 @@ def context(bool)
   end
 
   describe '#open?' do
-    context 'for true value' do
+    context 'with true value' do
       it 'returns true' do
         expect(subject.open?(context(true))).to be(true)
       end
     end
 
-    context 'for false value' do
+    context 'with false value' do
       it 'returns false' do
         expect(subject.open?(context(false))).to be(false)
       end
diff --git a/spec/flipper/gates/group_spec.rb b/spec/flipper/gates/group_spec.rb
index fcb719492..7b8e170cf 100644
--- a/spec/flipper/gates/group_spec.rb
+++ b/spec/flipper/gates/group_spec.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Gates::Group do
-  let(:feature_name) { :search }
-
   subject do
     described_class.new
   end
 
+  let(:feature_name) { :search }
+
   def context(set)
     Flipper::FeatureCheckContext.new(
       feature_name: feature_name,
diff --git a/spec/flipper/gates/percentage_of_actors_spec.rb b/spec/flipper/gates/percentage_of_actors_spec.rb
index 95d6fc04d..44b482ec5 100644
--- a/spec/flipper/gates/percentage_of_actors_spec.rb
+++ b/spec/flipper/gates/percentage_of_actors_spec.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Gates::PercentageOfActors do
-  let(:feature_name) { :search }
-
   subject do
     described_class.new
   end
 
+  let(:feature_name) { :search }
+
   def context(percentage_of_actors_value, feature = feature_name, thing = nil)
     Flipper::FeatureCheckContext.new(
       feature_name: feature,
@@ -50,7 +52,9 @@ def context(percentage_of_actors_value, feature = feature_name, thing = nil)
       end
     end
 
-    context 'for fractional percentage' do
+    context 'with fractional percentage' do
+      subject { described_class.new }
+
       let(:decimal) { 0.001 }
       let(:percentage) { decimal * 100 }
       let(:number_of_actors) { 10_000 }
@@ -59,8 +63,6 @@ def context(percentage_of_actors_value, feature = feature_name, thing = nil)
         (1..number_of_actors).map { |n| Flipper::Actor.new(n) }
       end
 
-      subject { described_class.new }
-
       it 'enables feature for accurate number of actors' do
         margin_of_error = 0.02 * number_of_actors
         expected_open_count = number_of_actors * decimal
diff --git a/spec/flipper/gates/percentage_of_time_spec.rb b/spec/flipper/gates/percentage_of_time_spec.rb
index 1ce386c78..2e7c8f2fb 100644
--- a/spec/flipper/gates/percentage_of_time_spec.rb
+++ b/spec/flipper/gates/percentage_of_time_spec.rb
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Gates::PercentageOfTime do
-  let(:feature_name) { :search }
-
   subject do
     described_class.new
   end
 
+  let(:feature_name) { :search }
+
   def context(percentage_of_time_value, feature = feature_name, thing = nil)
     Flipper::FeatureCheckContext.new(
       feature_name: feature,
@@ -16,13 +18,13 @@ def context(percentage_of_time_value, feature = feature_name, thing = nil)
   end
 
   describe '#open?' do
-    context 'for fractional percentage' do
+    context 'with fractional percentage' do
+      subject { described_class.new }
+
       let(:decimal) { 0.001 }
       let(:percentage) { decimal * 100 }
       let(:number_of_invocations) { 10_000 }
 
-      subject { described_class.new }
-
       it 'enables feature for accurate percentage of time' do
         margin_of_error = 0.02 * number_of_invocations
         expected_open_count = number_of_invocations * decimal
diff --git a/spec/flipper/instrumentation/log_subscriber_spec.rb b/spec/flipper/instrumentation/log_subscriber_spec.rb
index 1ec8d400a..ddea85ccb 100644
--- a/spec/flipper/instrumentation/log_subscriber_spec.rb
+++ b/spec/flipper/instrumentation/log_subscriber_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'logger'
 require 'helper'
 require 'flipper/adapters/instrumented'
diff --git a/spec/flipper/instrumentation/statsd_subscriber_spec.rb b/spec/flipper/instrumentation/statsd_subscriber_spec.rb
index 1e596815d..fddc0a0ec 100644
--- a/spec/flipper/instrumentation/statsd_subscriber_spec.rb
+++ b/spec/flipper/instrumentation/statsd_subscriber_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/adapters/instrumented'
 require 'flipper/instrumentation/statsd'
@@ -37,7 +39,7 @@ def assert_counter(metric)
     expect(result).not_to be_nil
   end
 
-  context 'for enabled feature' do
+  context 'with enabled feature' do
     it 'updates feature metrics when calls happen' do
       flipper[:stats].enable(user)
       assert_timer 'flipper.feature_operation.enable'
@@ -48,7 +50,7 @@ def assert_counter(metric)
     end
   end
 
-  context 'for disabled feature' do
+  context 'with disabled feature' do
     it 'updates feature metrics when calls happen' do
       flipper[:stats].disable(user)
       assert_timer 'flipper.feature_operation.disable'
diff --git a/spec/flipper/instrumenters/memory_spec.rb b/spec/flipper/instrumenters/memory_spec.rb
index 26f769308..ae6977ba7 100644
--- a/spec/flipper/instrumenters/memory_spec.rb
+++ b/spec/flipper/instrumenters/memory_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/instrumenters/memory'
 
diff --git a/spec/flipper/instrumenters/noop_spec.rb b/spec/flipper/instrumenters/noop_spec.rb
index d7b075446..4d0dd6d41 100644
--- a/spec/flipper/instrumenters/noop_spec.rb
+++ b/spec/flipper/instrumenters/noop_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Instrumenters::Noop do
diff --git a/spec/flipper/middleware/memoizer_spec.rb b/spec/flipper/middleware/memoizer_spec.rb
index e6df6ecab..087d48e16 100644
--- a/spec/flipper/middleware/memoizer_spec.rb
+++ b/spec/flipper/middleware/memoizer_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'rack/test'
 require 'active_support/cache'
@@ -74,7 +76,7 @@
       flipper.adapter.cache['hello'] = 'world'
       begin
         get '/fail', {}, 'flipper' => flipper
-      rescue
+      rescue StandardError
         nil
       end
       expect(flipper.adapter.cache).to be_empty
@@ -171,7 +173,7 @@
       middleware = described_class
 
       Rack::Builder.new do
-        use middleware, preload: %i(stats)
+        use middleware, preload: [:stats]
 
         map '/' do
           run ->(_env) { [200, {}, []] }
@@ -197,7 +199,7 @@
         [200, {}, []]
       end
 
-      middleware = described_class.new app, preload: %i(stats)
+      middleware = described_class.new app, preload: [:stats]
       middleware.call(env)
 
       expect(adapter.count(:get_multi)).to be(1)
@@ -214,7 +216,7 @@
         [200, {}, []]
       end
 
-      middleware = described_class.new app, preload: %i(stats)
+      middleware = described_class.new app, preload: [:stats]
       middleware.call(env)
 
       expect(adapter.count(:get)).to be(1)
@@ -224,13 +226,11 @@
 
   context 'when an app raises an exception' do
     it 'resets memoize' do
-      begin
-        app = ->(_env) { raise }
-        middleware = described_class.new(app)
-        middleware.call(env)
-      rescue RuntimeError
-        expect(flipper.memoizing?).to be(false)
-      end
+      app = ->(_env) { raise }
+      middleware = described_class.new(app)
+      middleware.call(env)
+    rescue RuntimeError
+      expect(flipper.memoizing?).to be(false)
     end
   end
 
@@ -328,7 +328,7 @@
     end
 
     it 'does NOT preload_all if request matches unless block' do
-      expect(flipper).to receive(:preload_all).never
+      expect(flipper).not_to receive(:preload_all)
       get '/assets/foo.png', {}, 'flipper' => flipper
     end
 
diff --git a/spec/flipper/middleware/setup_env_spec.rb b/spec/flipper/middleware/setup_env_spec.rb
index 2a3c8981a..7325e41b9 100644
--- a/spec/flipper/middleware/setup_env_spec.rb
+++ b/spec/flipper/middleware/setup_env_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::Middleware::SetupEnv do
diff --git a/spec/flipper/registry_spec.rb b/spec/flipper/registry_spec.rb
index d661a7580..a40f0e7a0 100644
--- a/spec/flipper/registry_spec.rb
+++ b/spec/flipper/registry_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/registry'
 
@@ -87,7 +89,7 @@
     end
 
     it 'returns the keys' do
-      expect(subject.keys.map(&:to_s).sort).to eq(%w(admins devs))
+      expect(subject.keys.map(&:to_s).sort).to eq(%w[admins devs])
     end
 
     it 'returns the keys as symbols' do
@@ -104,7 +106,7 @@
     end
 
     it 'returns the values' do
-      expect(subject.values.map(&:to_s).sort).to eq(%w(admins devs))
+      expect(subject.values.map(&:to_s).sort).to eq(%w[admins devs])
     end
   end
 
@@ -123,8 +125,8 @@
         values << value
       end
 
-      expect(keys.map(&:to_s).sort).to eq(%w(admins devs))
-      expect(values.sort).to eq(%w(admins devs))
+      expect(keys.map(&:to_s).sort).to eq(%w[admins devs])
+      expect(values.sort).to eq(%w[admins devs])
     end
   end
 
diff --git a/spec/flipper/typecast_spec.rb b/spec/flipper/typecast_spec.rb
index 99072a3a7..d9b19cc63 100644
--- a/spec/flipper/typecast_spec.rb
+++ b/spec/flipper/typecast_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/typecast'
 
diff --git a/spec/flipper/types/actor_spec.rb b/spec/flipper/types/actor_spec.rb
index 6abec0b9f..c61b353d3 100644
--- a/spec/flipper/types/actor_spec.rb
+++ b/spec/flipper/types/actor_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/types/actor'
 
@@ -39,7 +41,7 @@ def admin?
   end
 
   describe '.wrap' do
-    context 'for actor' do
+    context 'with actor' do
       it 'returns actor' do
         actor = described_class.wrap(subject)
         expect(actor).to be_instance_of(described_class)
@@ -47,7 +49,7 @@ def admin?
       end
     end
 
-    context 'for other thing' do
+    context 'with other thing' do
       it 'returns actor' do
         thing = thing_class.new('1')
         actor = described_class.wrap(thing)
diff --git a/spec/flipper/types/boolean_spec.rb b/spec/flipper/types/boolean_spec.rb
index d82f433f0..69f5444a4 100644
--- a/spec/flipper/types/boolean_spec.rb
+++ b/spec/flipper/types/boolean_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/types/boolean'
 
diff --git a/spec/flipper/types/group_spec.rb b/spec/flipper/types/group_spec.rb
index 2d500187c..6a66b09e7 100644
--- a/spec/flipper/types/group_spec.rb
+++ b/spec/flipper/types/group_spec.rb
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/types/group'
 
 RSpec.describe Flipper::Types::Group do
-  let(:fake_context) { double('FeatureCheckContext') }
-
   subject do
     Flipper.register(:admins, &:admin?)
   end
 
+  let(:fake_context) { double('FeatureCheckContext') }
+
   describe '.wrap' do
     context 'with group instance' do
       it 'returns group instance' do
@@ -55,14 +57,14 @@
       group = described_class.new(:examples) do |actor|
         actor.email =~ /@example\.com/
       end
-      expect(group.match?(double('Actor', email: 'foo@example.com'), fake_context)).to be_truthy
+      expect(group).to be_match(double('Actor', email: 'foo@example.com'), fake_context)
     end
 
     it 'returns false for falsey block results' do
       group = described_class.new(:examples) do |_actor|
         nil
       end
-      expect(group.match?(double('Actor'), fake_context)).to be_falsey
+      expect(group).not_to be_match(double('Actor'), fake_context)
     end
 
     it 'returns true for truthy shortand block results' do
@@ -73,7 +75,7 @@ def admin?
       end.new
 
       group = described_class.new(:admin, &:admin?)
-      expect(group.match?(actor, fake_context)).to be_truthy
+      expect(group).to be_match(actor, fake_context)
     end
 
     it 'returns false for falsy shortand block results' do
@@ -84,7 +86,7 @@ def admin?
       end.new
 
       group = described_class.new(:admin, &:admin?)
-      expect(group.match?(actor, fake_context)).to be_falsey
+      expect(group).not_to be_match(actor, fake_context)
     end
 
     it 'can yield without context as block argument' do
diff --git a/spec/flipper/types/percentage_of_actors_spec.rb b/spec/flipper/types/percentage_of_actors_spec.rb
index d34785097..697b05915 100644
--- a/spec/flipper/types/percentage_of_actors_spec.rb
+++ b/spec/flipper/types/percentage_of_actors_spec.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/types/percentage_of_actors'
 
 RSpec.describe Flipper::Types::PercentageOfActors do
-  it_should_behave_like 'a percentage'
+  it_behaves_like 'a percentage'
 end
diff --git a/spec/flipper/types/percentage_of_time_spec.rb b/spec/flipper/types/percentage_of_time_spec.rb
index 07e12ea9d..024b52052 100644
--- a/spec/flipper/types/percentage_of_time_spec.rb
+++ b/spec/flipper/types/percentage_of_time_spec.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/types/percentage_of_time'
 
 RSpec.describe Flipper::Types::PercentageOfTime do
-  it_should_behave_like 'a percentage'
+  it_behaves_like 'a percentage'
 end
diff --git a/spec/flipper/types/percentage_spec.rb b/spec/flipper/types/percentage_spec.rb
index 6d6a826a3..1a60378e0 100644
--- a/spec/flipper/types/percentage_spec.rb
+++ b/spec/flipper/types/percentage_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/types/percentage_of_actors'
 
@@ -5,7 +7,8 @@
   subject do
     described_class.new(5)
   end
-  it_should_behave_like 'a percentage'
+
+  it_behaves_like 'a percentage'
 
   describe '.wrap' do
     context 'with percentage instance' do
diff --git a/spec/flipper/ui/action_spec.rb b/spec/flipper/ui/action_spec.rb
index dafab01c1..fe1861d81 100644
--- a/spec/flipper/ui/action_spec.rb
+++ b/spec/flipper/ui/action_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Action do
diff --git a/spec/flipper/ui/actions/actors_gate_spec.rb b/spec/flipper/ui/actions/actors_gate_spec.rb
index eb3ace17c..ea694a7e5 100644
--- a/spec/flipper/ui/actions/actors_gate_spec.rb
+++ b/spec/flipper/ui/actions/actors_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::ActorsGate do
@@ -69,7 +71,7 @@
         end
       end
 
-      context 'for an invalid actor value' do
+      context 'with an invalid actor value' do
         context 'empty value' do
           let(:value) { '' }
 
diff --git a/spec/flipper/ui/actions/add_feature_spec.rb b/spec/flipper/ui/actions/add_feature_spec.rb
index 2b85b31fd..03cb92837 100644
--- a/spec/flipper/ui/actions/add_feature_spec.rb
+++ b/spec/flipper/ui/actions/add_feature_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::AddFeature do
diff --git a/spec/flipper/ui/actions/boolean_gate_spec.rb b/spec/flipper/ui/actions/boolean_gate_spec.rb
index f9448a2c4..c44e07ab7 100644
--- a/spec/flipper/ui/actions/boolean_gate_spec.rb
+++ b/spec/flipper/ui/actions/boolean_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::BooleanGate do
diff --git a/spec/flipper/ui/actions/feature_spec.rb b/spec/flipper/ui/actions/feature_spec.rb
index f7c92b630..8b8288cc7 100644
--- a/spec/flipper/ui/actions/feature_spec.rb
+++ b/spec/flipper/ui/actions/feature_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::Feature do
@@ -31,13 +33,11 @@
 
     context 'when feature_removal_enabled is set to false' do
       around do |example|
-        begin
-          @original_feature_removal_enabled = Flipper::UI.configuration.feature_removal_enabled
-          Flipper::UI.configuration.feature_removal_enabled = false
-          example.run
-        ensure
-          Flipper::UI.configuration.feature_removal_enabled = @original_feature_removal_enabled
-        end
+        @original_feature_removal_enabled = Flipper::UI.configuration.feature_removal_enabled
+        Flipper::UI.configuration.feature_removal_enabled = false
+        example.run
+      ensure
+        Flipper::UI.configuration.feature_removal_enabled = @original_feature_removal_enabled
       end
 
       it 'returns with 403 status' do
diff --git a/spec/flipper/ui/actions/features_spec.rb b/spec/flipper/ui/actions/features_spec.rb
index 158c22f98..ec536c952 100644
--- a/spec/flipper/ui/actions/features_spec.rb
+++ b/spec/flipper/ui/actions/features_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::Features do
@@ -42,6 +44,7 @@
 
       context "when fun mode is enabled" do
         let(:fun_mode) { true }
+
         before { get '/features' }
 
         it 'responds with success' do
@@ -55,6 +58,7 @@
 
       context "when fun mode is disabled" do
         let(:fun_mode) { false }
+
         before { get '/features' }
 
         it 'responds with success' do
@@ -103,7 +107,7 @@
         end
       end
 
-      context 'for an invalid feature name' do
+      context 'with an invalid feature name' do
         context 'empty feature name' do
           let(:feature_name) { '' }
 
diff --git a/spec/flipper/ui/actions/file_spec.rb b/spec/flipper/ui/actions/file_spec.rb
index c5f0923ff..248d17552 100644
--- a/spec/flipper/ui/actions/file_spec.rb
+++ b/spec/flipper/ui/actions/file_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::File do
diff --git a/spec/flipper/ui/actions/groups_gate_spec.rb b/spec/flipper/ui/actions/groups_gate_spec.rb
index a74a2f63e..540e31999 100644
--- a/spec/flipper/ui/actions/groups_gate_spec.rb
+++ b/spec/flipper/ui/actions/groups_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::GroupsGate do
@@ -68,7 +70,7 @@
         end
       end
 
-      context 'for an unregistered group' do
+      context 'with an unregistered group' do
         context 'unknown group name' do
           let(:group_name) { 'not_here' }
 
diff --git a/spec/flipper/ui/actions/home_spec.rb b/spec/flipper/ui/actions/home_spec.rb
index 639613622..4b6cbeb46 100644
--- a/spec/flipper/ui/actions/home_spec.rb
+++ b/spec/flipper/ui/actions/home_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::Home do
diff --git a/spec/flipper/ui/actions/percentage_of_actors_gate_spec.rb b/spec/flipper/ui/actions/percentage_of_actors_gate_spec.rb
index 78bbe2c3b..2178975ce 100644
--- a/spec/flipper/ui/actions/percentage_of_actors_gate_spec.rb
+++ b/spec/flipper/ui/actions/percentage_of_actors_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::PercentageOfActorsGate do
diff --git a/spec/flipper/ui/actions/percentage_of_time_gate_spec.rb b/spec/flipper/ui/actions/percentage_of_time_gate_spec.rb
index 2e71f7fad..8aa767ea5 100644
--- a/spec/flipper/ui/actions/percentage_of_time_gate_spec.rb
+++ b/spec/flipper/ui/actions/percentage_of_time_gate_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Actions::PercentageOfTimeGate do
diff --git a/spec/flipper/ui/configuration_spec.rb b/spec/flipper/ui/configuration_spec.rb
index d0f52207f..608287581 100644
--- a/spec/flipper/ui/configuration_spec.rb
+++ b/spec/flipper/ui/configuration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Configuration do
diff --git a/spec/flipper/ui/decorators/feature_spec.rb b/spec/flipper/ui/decorators/feature_spec.rb
index 8f5cba743..8420f217d 100644
--- a/spec/flipper/ui/decorators/feature_spec.rb
+++ b/spec/flipper/ui/decorators/feature_spec.rb
@@ -1,15 +1,17 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI::Decorators::Feature do
+  subject do
+    described_class.new(feature)
+  end
+
   let(:source)  { {} }
   let(:adapter) { Flipper::Adapters::Memory.new(source) }
   let(:flipper) { build_flipper }
   let(:feature) { flipper[:some_awesome_feature] }
 
-  subject do
-    described_class.new(feature)
-  end
-
   describe '#initialize' do
     it 'sets the feature' do
       expect(subject.feature).to be(feature)
diff --git a/spec/flipper/ui/decorators/gate_spec.rb b/spec/flipper/ui/decorators/gate_spec.rb
index 11a51b0dc..bcc81cbbb 100644
--- a/spec/flipper/ui/decorators/gate_spec.rb
+++ b/spec/flipper/ui/decorators/gate_spec.rb
@@ -1,17 +1,19 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/ui/decorators/gate'
 
 RSpec.describe Flipper::UI::Decorators::Gate do
+  subject do
+    described_class.new(gate, false)
+  end
+
   let(:source)  { {} }
   let(:adapter) { Flipper::Adapters::Memory.new(source) }
   let(:flipper) { build_flipper }
   let(:feature) { flipper[:some_awesome_feature] }
   let(:gate) { feature.gate(:boolean) }
 
-  subject do
-    described_class.new(gate, false)
-  end
-
   describe '#initialize' do
     it 'sets gate' do
       expect(subject.gate).to be(gate)
diff --git a/spec/flipper/ui/util_spec.rb b/spec/flipper/ui/util_spec.rb
index 6f3fb7340..697422c73 100644
--- a/spec/flipper/ui/util_spec.rb
+++ b/spec/flipper/ui/util_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/ui/util'
 
diff --git a/spec/flipper/ui_spec.rb b/spec/flipper/ui_spec.rb
index 7698eb238..0263b71d3 100644
--- a/spec/flipper/ui_spec.rb
+++ b/spec/flipper/ui_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper::UI do
@@ -96,13 +98,11 @@
 
       describe 'when set' do
         around do |example|
-          begin
-            @original_banner_text = described_class.configuration.banner_text
-            described_class.configuration.banner_text = 'Production Environment'
-            example.run
-          ensure
-            described_class.configuration.banner_text = @original_banner_text
-          end
+          @original_banner_text = described_class.configuration.banner_text
+          described_class.configuration.banner_text = 'Production Environment'
+          example.run
+        ensure
+          described_class.configuration.banner_text = @original_banner_text
         end
 
         it 'includes banner' do
@@ -177,14 +177,14 @@
           configuration.feature_creation_enabled = true
         end
 
+        after do
+          configuration.feature_creation_enabled = @original_feature_creation_enabled
+        end
+
         it 'has the add_feature button' do
           get '/features'
           expect(last_response.body).to include('Add Feature')
         end
-
-        after do
-          configuration.feature_creation_enabled = @original_feature_creation_enabled
-        end
       end
 
       context 'with feature_creation_enabled set to false' do
@@ -193,14 +193,14 @@
           configuration.feature_creation_enabled = false
         end
 
+        after do
+          configuration.feature_creation_enabled = @original_feature_creation_enabled
+        end
+
         it 'does not have the add_feature button' do
           get '/features'
           expect(last_response.body).not_to include('Add Feature')
         end
-
-        after do
-          configuration.feature_creation_enabled = @original_feature_creation_enabled
-        end
       end
     end
 
@@ -215,14 +215,14 @@
           configuration.feature_removal_enabled = true
         end
 
+        after do
+          configuration.feature_removal_enabled = @original_feature_removal_enabled
+        end
+
         it 'has the add_feature button' do
           get '/features/test'
           expect(last_response.body).to include('Delete')
         end
-
-        after do
-          configuration.feature_removal_enabled = @original_feature_removal_enabled
-        end
       end
 
       context 'with feature_removal_enabled set to false' do
@@ -231,14 +231,14 @@
           configuration.feature_removal_enabled = false
         end
 
+        after do
+          configuration.feature_removal_enabled = @original_feature_removal_enabled
+        end
+
         it 'does not have the add_feature button' do
           get '/features/test'
           expect(last_response.body).not_to include('Delete')
         end
-
-        after do
-          configuration.feature_removal_enabled = @original_feature_removal_enabled
-        end
       end
     end
   end
diff --git a/spec/flipper_spec.rb b/spec/flipper_spec.rb
index b02814f60..2395c3829 100644
--- a/spec/flipper_spec.rb
+++ b/spec/flipper_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 
 RSpec.describe Flipper do
@@ -265,7 +267,7 @@
 
   describe '.unregister_groups' do
     it 'clear group registry' do
-      expect(described_class.groups_registry).to receive(:clear)
+      expect(described_class.groups_registry).to have_receive(:clear)
       described_class.unregister_groups
     end
   end
@@ -282,7 +284,7 @@
   end
 
   describe '.group' do
-    context 'for registered group' do
+    context 'with registered group' do
       before do
         @group = described_class.register(:admins) {}
       end
@@ -296,7 +298,7 @@
       end
     end
 
-    context 'for unregistered group' do
+    context 'with unregistered group' do
       before do
         @group = described_class.group(:cats)
       end
diff --git a/spec/helper.rb b/spec/helper.rb
index af43d907c..f73c8e1d8 100644
--- a/spec/helper.rb
+++ b/spec/helper.rb
@@ -1,4 +1,6 @@
-$LOAD_PATH.unshift(File.expand_path('../../lib', __FILE__))
+# frozen_string_literal: true
+
+$LOAD_PATH.unshift(File.expand_path('../lib', __dir__))
 
 require 'pp'
 require 'pathname'
@@ -20,7 +22,7 @@
 Dir[FlipperRoot.join('spec/support/**/*.rb')].each { |f| require f }
 
 RSpec.configure do |config|
-  config.before(:example) do
+  config.before do
     Flipper.unregister_groups
     Flipper.configuration = nil
   end
diff --git a/spec/integration_spec.rb b/spec/integration_spec.rb
index 45939e012..34bff6886 100644
--- a/spec/integration_spec.rb
+++ b/spec/integration_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'flipper/feature'
 
@@ -211,7 +213,7 @@
         expect(feature.enabled?).to eq(false)
       end
 
-      it 'disables for individual actor' do
+      it 'disables for individual actor and percentage of time' do
         expect(feature.enabled?(pitt)).to eq(false)
       end
 
@@ -228,10 +230,6 @@
         expect(enabled).to be(0)
       end
 
-      it 'disables percentage of time' do
-        expect(feature.enabled?(pitt)).to eq(false)
-      end
-
       it 'adds feature to set of features' do
         expect(flipper.features.map(&:name)).to include(:search)
       end
@@ -368,7 +366,7 @@
       end
     end
 
-    context 'for actor in enabled group' do
+    context 'with actor in enabled group' do
       before do
         feature.enable admin_group
       end
@@ -383,7 +381,7 @@
       end
     end
 
-    context 'for actor in disabled group' do
+    context 'with actor in disabled group' do
       it 'returns false' do
         expect(feature.enabled?(flipper.actor(dev_thing))).to eq(false)
         expect(feature.enabled?(dev_thing)).to eq(false)
@@ -394,7 +392,7 @@
       end
     end
 
-    context 'for enabled actor' do
+    context 'with enabled actor' do
       before do
         feature.enable pitt
       end
@@ -404,7 +402,7 @@
       end
     end
 
-    context 'for not enabled actor' do
+    context 'with not enabled actor' do
       it 'returns false' do
         expect(feature.enabled?(clooney)).to eq(false)
       end
@@ -415,7 +413,7 @@
       end
     end
 
-    context 'for enabled percentage of time' do
+    context 'with enabled percentage of time' do
       before do
         # ensure percentage of time returns percentage that makes five percent
         # of time true
@@ -433,7 +431,7 @@
       end
     end
 
-    context 'for enabled float percentage of time' do
+    context 'with enabled float percentage of time' do
       before do
         # ensure percentage of time returns percentage that makes 4.1 percent
         # of time true
@@ -451,7 +449,7 @@
       end
     end
 
-    context 'for NOT enabled integer percentage of time' do
+    context 'with NOT enabled integer percentage of time' do
       before do
         # ensure percentage of time returns percentage that makes enabled? false
         @gate = feature.gate(:percentage_of_time)
@@ -476,7 +474,7 @@
       end
     end
 
-    context 'for NOT enabled float percentage of time' do
+    context 'with NOT enabled float percentage of time' do
       before do
         # ensure percentage of time returns percentage that makes enabled? false
         @gate = feature.gate(:percentage_of_time)
@@ -501,7 +499,7 @@
       end
     end
 
-    context 'for a non flipper thing' do
+    context 'with a non flipper thing' do
       before do
         feature.enable admin_group
       end
@@ -522,7 +520,7 @@
     end
   end
 
-  context 'enabling multiple groups, disabling everything, then enabling one group' do
+  context 'with enabling multiple groups, disabling everything, then enabling one group' do
     before do
       feature.enable(admin_group)
       feature.enable(dev_group)
diff --git a/spec/support/fake_udp_socket.rb b/spec/support/fake_udp_socket.rb
index 40367d23c..9d66005b5 100644
--- a/spec/support/fake_udp_socket.rb
+++ b/spec/support/fake_udp_socket.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class FakeUDPSocket
   attr_reader :buffer
 
diff --git a/spec/support/spec_helpers.rb b/spec/support/spec_helpers.rb
index d26e3dbd2..7e28f4559 100644
--- a/spec/support/spec_helpers.rb
+++ b/spec/support/spec_helpers.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'json'
 require 'rack/test'
 
diff --git a/test/adapters/active_record_test.rb b/test/adapters/active_record_test.rb
index 6ee3aadb3..ad3e3974a 100644
--- a/test/adapters/active_record_test.rb
+++ b/test/adapters/active_record_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'flipper/adapters/active_record'
 
@@ -53,7 +55,6 @@ def test_models_honor_table_name_prefixes_and_suffixes
 
     assert_equal "foo_flipper_features_bar", Flipper::Adapters::ActiveRecord::Feature.table_name
     assert_equal "foo_flipper_gates_bar", Flipper::Adapters::ActiveRecord::Gate.table_name
-
   ensure
     ActiveRecord::Base.table_name_prefix = ""
     ActiveRecord::Base.table_name_suffix = ""
diff --git a/test/adapters/dalli_test.rb b/test/adapters/dalli_test.rb
index 9cdce24af..31f8b1bd5 100644
--- a/test/adapters/dalli_test.rb
+++ b/test/adapters/dalli_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'flipper/adapters/dalli'
 
diff --git a/test/adapters/memory_test.rb b/test/adapters/memory_test.rb
index 3acb4e757..bd2072008 100644
--- a/test/adapters/memory_test.rb
+++ b/test/adapters/memory_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class MemoryTest < MiniTest::Test
diff --git a/test/adapters/mongo_test.rb b/test/adapters/mongo_test.rb
index 91b2a2e55..a0ced6e37 100644
--- a/test/adapters/mongo_test.rb
+++ b/test/adapters/mongo_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'flipper/adapters/mongo'
 
diff --git a/test/adapters/pstore_test.rb b/test/adapters/pstore_test.rb
index 71ab76fa6..a8c8051ea 100644
--- a/test/adapters/pstore_test.rb
+++ b/test/adapters/pstore_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'flipper/adapters/pstore'
 
diff --git a/test/adapters/redis_cache_test.rb b/test/adapters/redis_cache_test.rb
index ad4b65d19..e8dd2fa02 100644
--- a/test/adapters/redis_cache_test.rb
+++ b/test/adapters/redis_cache_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'flipper/adapters/redis_cache'
 
diff --git a/test/adapters/redis_test.rb b/test/adapters/redis_test.rb
index 2d9ce5c49..ed48eafcc 100644
--- a/test/adapters/redis_test.rb
+++ b/test/adapters/redis_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'flipper/adapters/redis'
 
diff --git a/test/adapters/sequel_test.rb b/test/adapters/sequel_test.rb
index 93e83e4b4..af930c9c7 100644
--- a/test/adapters/sequel_test.rb
+++ b/test/adapters/sequel_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 require 'sequel'
 
diff --git a/test/generators/flipper/active_record_generator_test.rb b/test/generators/flipper/active_record_generator_test.rb
index 5ac688e39..5ace4cb43 100644
--- a/test/generators/flipper/active_record_generator_test.rb
+++ b/test/generators/flipper/active_record_generator_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'helper'
 require 'active_record'
 require 'rails/generators/test_case'
@@ -5,7 +7,7 @@
 
 class FlipperActiveRecordGeneratorTest < Rails::Generators::TestCase
   tests Flipper::Generators::ActiveRecordGenerator
-  destination File.expand_path('../../../../tmp', __FILE__)
+  destination File.expand_path('../../../tmp', __dir__)
   setup :prepare_destination
 
   def test_generates_migration
@@ -15,29 +17,29 @@ def test_generates_migration
                         else
                           "[#{Rails::VERSION::MAJOR}.#{Rails::VERSION::MINOR}]"
                         end
-    assert_migration 'db/migrate/create_flipper_tables.rb', <<-EOM
-class CreateFlipperTables < ActiveRecord::Migration#{migration_version}
-  def self.up
-    create_table :flipper_features do |t|
-      t.string :key, null: false
-      t.timestamps null: false
-    end
-    add_index :flipper_features, :key, unique: true
+    assert_migration 'db/migrate/create_flipper_tables.rb', <<~MIGRATION
+      class CreateFlipperTables < ActiveRecord::Migration#{migration_version}
+        def self.up
+          create_table :flipper_features do |t|
+            t.string :key, null: false
+            t.timestamps null: false
+          end
+          add_index :flipper_features, :key, unique: true
 
-    create_table :flipper_gates do |t|
-      t.string :feature_key, null: false
-      t.string :key, null: false
-      t.string :value
-      t.timestamps null: false
-    end
-    add_index :flipper_gates, [:feature_key, :key, :value], unique: true
-  end
+          create_table :flipper_gates do |t|
+            t.string :feature_key, null: false
+            t.string :key, null: false
+            t.string :value
+            t.timestamps null: false
+          end
+          add_index :flipper_gates, [:feature_key, :key, :value], unique: true
+        end
 
-  def self.down
-    drop_table :flipper_gates
-    drop_table :flipper_features
-  end
-end
-EOM
+        def self.down
+          drop_table :flipper_gates
+          drop_table :flipper_features
+        end
+      end
+    MIGRATION
   end
 end
diff --git a/test/helper.rb b/test/helper.rb
index 4589bdce2..ccb0d36c4 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rubygems'
 require 'bundler'
 Bundler.setup(:default)
diff --git a/test/test_helper.rb b/test/test_helper.rb
index d80df34c1..4759d5884 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'flipper'
 require 'minitest/autorun'
 require 'minitest/unit'