diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index e58fbbd..b561d3e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,6 +17,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         ruby-version:
+          - '3.0'
           - '3.1'
           - '3.2'
           - '3.3'
diff --git a/Gemfile b/Gemfile
index 5521082..687403b 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,7 +1,8 @@
 source "https://rubygems.org"
 
 gemspec
-gem "rake"
+gem "m"
 gem "minitest"
+gem "rake"
+gem "simplecov"
 gem "standard"
-gem "m"
diff --git a/Gemfile.lock b/Gemfile.lock
index 2bf1f1e..9590368 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -8,36 +8,41 @@ PATH
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (7.2.1)
+    activesupport (7.1.5)
       base64
+      benchmark (>= 0.3)
       bigdecimal
-      concurrent-ruby (~> 1.0, >= 1.3.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
       connection_pool (>= 2.2.5)
       drb
       i18n (>= 1.6, < 2)
       logger (>= 1.4.2)
       minitest (>= 5.1)
+      mutex_m
       securerandom (>= 0.3)
-      tzinfo (~> 2.0, >= 2.0.5)
+      tzinfo (~> 2.0)
     ast (2.4.2)
     base64 (0.2.0)
+    benchmark (0.4.0)
     bigdecimal (3.1.8)
     concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
+    docile (1.4.1)
     drb (2.2.1)
-    i18n (1.14.5)
+    i18n (1.14.6)
       concurrent-ruby (~> 1.0)
-    json (2.7.2)
+    json (2.8.1)
     language_server-protocol (3.17.0.3)
     lint_roller (1.1.0)
-    logger (1.6.0)
+    logger (1.6.1)
     m (1.6.2)
       method_source (>= 0.6.7)
       rake (>= 0.9.2.2)
     method_source (1.1.0)
     minitest (5.25.1)
+    mutex_m (0.2.0)
     parallel (1.26.3)
-    parser (3.3.4.2)
+    parser (3.3.6.0)
       ast (~> 2.4.1)
       racc
     racc (1.8.1)
@@ -45,22 +50,19 @@ GEM
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.9.2)
-    rexml (3.3.6)
-      strscan
-    rubocop (1.65.1)
+    rubocop (1.66.1)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 2.4, < 3.0)
-      rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.31.1, < 2.0)
+      rubocop-ast (>= 1.32.2, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.32.1)
+    rubocop-ast (1.34.1)
       parser (>= 3.3.1.0)
-    rubocop-performance (1.21.1)
+    rubocop-performance (1.22.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
     rubocop-rails (2.26.0)
@@ -70,36 +72,43 @@ GEM
       rubocop-ast (>= 1.31.1, < 2.0)
     ruby-progressbar (1.13.0)
     securerandom (0.3.1)
-    standard (1.40.0)
+    simplecov (0.22.0)
+      docile (~> 1.1)
+      simplecov-html (~> 0.11)
+      simplecov_json_formatter (~> 0.1)
+    simplecov-html (0.13.1)
+    simplecov_json_formatter (0.1.4)
+    standard (1.41.1)
       language_server-protocol (~> 3.17.0.2)
       lint_roller (~> 1.0)
-      rubocop (~> 1.65.0)
+      rubocop (~> 1.66.0)
       standard-custom (~> 1.0.0)
-      standard-performance (~> 1.4)
+      standard-performance (~> 1.5)
     standard-custom (1.0.2)
       lint_roller (~> 1.0)
       rubocop (~> 1.50)
-    standard-performance (1.4.0)
+    standard-performance (1.5.0)
       lint_roller (~> 1.1)
-      rubocop-performance (~> 1.21.0)
-    strscan (3.1.0)
+      rubocop-performance (~> 1.22.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.5.0)
+    unicode-display_width (2.6.0)
 
 PLATFORMS
   arm64-darwin-20
   arm64-darwin-21
   arm64-darwin-22
   arm64-darwin-23
+  arm64-darwin-24
   x86_64-linux
 
 DEPENDENCIES
   m
   minitest
   rake
+  simplecov
   standard
   standard-rails!
 
 BUNDLED WITH
-   2.5.17
+   2.5.23
diff --git a/test/test_helper.rb b/test/test_helper.rb
index f24dca8..d5bb0c9 100644
--- a/test/test_helper.rb
+++ b/test/test_helper.rb
@@ -1,4 +1,12 @@
 $LOAD_PATH.unshift File.expand_path("../lib", __dir__)
+begin
+  require "simplecov"
+  SimpleCov.start do
+    load_profile "test_frameworks"
+  end
+rescue LoadError
+end
+
 require "standard/rails"
 
 require "minitest/autorun"