diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index c153dac3a..5f01458f2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -36,4 +36,4 @@ jobs:
     - name: Run RSpec tests
       run: bundle exec rspec
       env:
-        COVERALLS_REPO_TOKEN: glKUxWlZ56q0WwJhNh5znGTB8ZlFwfvZW
+        CODECOV_TOKEN: d8abdd06-9193-47d3-9da9-b4b25064e49b
diff --git a/Gemfile b/Gemfile
index 7133f90da..caf6cbf72 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source "https://rubygems.org"
 
 group :test do
   gem "activesupport"
-  gem "coveralls"
+  gem "codecov", require: false
   gem "guard-rspec"
   gem "guard-rubocop"
   gem "rspec"
diff --git a/Gemfile.lock b/Gemfile.lock
index 09418c141..a77f3c1bd 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,14 +8,12 @@ GEM
       tzinfo (~> 1.1)
       zeitwerk (~> 2.2, >= 2.2.2)
     ast (2.4.1)
+    codecov (0.1.17)
+      json
+      simplecov
+      url
     coderay (1.1.3)
     concurrent-ruby (1.1.6)
-    coveralls (0.8.23)
-      json (>= 1.8, < 3)
-      simplecov (~> 0.16.1)
-      term-ansicolor (~> 1.3)
-      thor (>= 0.19.4, < 2.0)
-      tins (~> 1.6)
     diff-lcs (1.4.4)
     docile (1.3.2)
     ffi (1.13.1)
@@ -88,21 +86,16 @@ GEM
       parser (>= 2.7.0.1)
     ruby-progressbar (1.10.1)
     shellany (0.0.1)
-    simplecov (0.16.1)
+    simplecov (0.18.5)
       docile (~> 1.1)
-      json (>= 1.8, < 3)
-      simplecov-html (~> 0.10.0)
-    simplecov-html (0.10.2)
-    sync (0.5.0)
-    term-ansicolor (1.7.1)
-      tins (~> 1.0)
+      simplecov-html (~> 0.11)
+    simplecov-html (0.12.2)
     thor (1.0.1)
     thread_safe (0.3.6)
-    tins (1.25.0)
-      sync
     tzinfo (1.2.7)
       thread_safe (~> 0.1)
     unicode-display_width (1.7.0)
+    url (0.3.2)
     zeitwerk (2.3.1)
 
 PLATFORMS
@@ -110,7 +103,7 @@ PLATFORMS
 
 DEPENDENCIES
   activesupport
-  coveralls
+  codecov
   guard-rspec
   guard-rubocop
   rspec
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index c2fe43a8f..53f640a26 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -35,18 +35,10 @@ def linux?
 
 formatters = [SimpleCov::Formatter::HTMLFormatter]
 
-if macos? && ENV["COVERALLS_REPO_TOKEN"]
-  require "coveralls"
-
-  formatters << Coveralls::SimpleCov::Formatter
-
-  ENV["CI"] = "1"
-  ENV["CI_NAME"] = "github-actions"
-  ENV["CI_BUILD_NUMBER"] = ENV["GITHUB_REF"]
-  ENV["CI_BRANCH"] = ENV["HEAD_GITHUB_REF"]
-  %r{refs/pull/(?<pr>\d+)/merge} =~ ENV["GITHUB_REF"]
-  ENV["CI_PULL_REQUEST"] = pr
-  ENV["CI_BUILD_URL"] = "https://github.com/#{ENV["GITHUB_REPOSITORY"]}/pull/#{pr}/checks"
+if macos? && ENV["CODECOV_TOKEN"]
+  require "codecov"
+
+  formatters << SimpleCov::Formatter::Codecov
 end
 
 SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(formatters)