diff --git a/Gemfile.lock b/Gemfile.lock
index 96ddcb8..fc8a78e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,30 +6,26 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (4.1.14.2)
-      activesupport (= 4.1.14.2)
-      builder (~> 3.1)
-    activerecord (4.1.14.2)
-      activemodel (= 4.1.14.2)
-      activesupport (= 4.1.14.2)
-      arel (~> 5.0.0)
-    activesupport (4.1.14.2)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
+    activemodel (5.2.8.1)
+      activesupport (= 5.2.8.1)
+    activerecord (5.2.8.1)
+      activemodel (= 5.2.8.1)
+      activesupport (= 5.2.8.1)
+      arel (>= 9.0)
+    activesupport (5.2.8.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.1)
       tzinfo (~> 1.1)
-    arel (5.0.1.20140414130214)
+    arel (9.0.0)
     ast (2.4.0)
     awesome_print (1.8.0)
-    builder (3.2.3)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.10)
     diff-lcs (1.3)
-    i18n (0.9.5)
+    i18n (1.11.0)
       concurrent-ruby (~> 1.0)
     jaro_winkler (1.5.3)
-    json (1.8.6)
-    minitest (5.11.3)
+    minitest (5.15.0)
     parallel (1.17.0)
     parser (2.6.3.0)
       ast (~> 2.4.0)
@@ -60,7 +56,7 @@ GEM
     ruby-progressbar (1.10.1)
     sqlite3 (1.3.13)
     thread_safe (0.3.6)
-    tzinfo (1.2.5)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     unicode-display_width (1.6.0)
 
@@ -68,7 +64,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord (~> 4.1.14.1)
+  activerecord (~> 5.2.8.1)
   awesome_print
   bundler (~> 1.17)
   nstore!
diff --git a/nstore.gemspec b/nstore.gemspec
index e852682..c8a0881 100644
--- a/nstore.gemspec
+++ b/nstore.gemspec
@@ -44,7 +44,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.add_development_dependency 'activerecord', '~> 4.1.14.1'
+  spec.add_development_dependency 'activerecord', '~> 5.2.8.1'
   spec.add_development_dependency 'awesome_print'
   spec.add_development_dependency 'bundler', '~> 1.17'
   spec.add_development_dependency 'rake', '~> 13.0'