diff --git a/.github/workflows/ruby.yml b/.github/workflows/ruby.yml
index 3e33190e..d1486942 100644
--- a/.github/workflows/ruby.yml
+++ b/.github/workflows/ruby.yml
@@ -17,39 +17,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby_version: [3.2, 3.1, "3.0", 2.7, 2.6, jruby]
+        ruby_version: [3.3, 3.2, 3.1, 3.0, jruby]
         gemfile:
           - Gemfile
-          - gemfiles/Gemfile.rails-5.2.x
           - gemfiles/Gemfile.rails-6.0.x
           - gemfiles/Gemfile.rails-6.1.x
           - gemfiles/Gemfile.rails-7.0.x
+          - gemfiles/Gemfile.rails-7.1.x
           - gemfiles/Gemfile.rails-main
         exclude:
-          # Ruby 3.2 is not supported by Rails 5.2.x
-          - ruby_version: 3.2
-            gemfile: gemfiles/Gemfile.rails-5.2.x
-
-          # Ruby 3.1 is not supported by Rails 5.2.x
-          - ruby_version: 3.1
-            gemfile: gemfiles/Gemfile.rails-5.2.x
-
-          # Ruby 3.x is not supported by Rails 5.2.x
-          - ruby_version: "3.0"
-            gemfile: gemfiles/Gemfile.rails-5.2.x
-
-          # Ruby 2.6.x is not supported by Rails main
-          - ruby_version: 2.6
-            gemfile: gemfiles/Gemfile.rails-main
-
-          # Ruby 2.6.x is not supported by Rails 7.0.x
-          - ruby_version: 2.6
-            gemfile: gemfiles/Gemfile.rails-7.0.x
-
-          # JRuby 9.4.2.0 (3.1.0) is not supported by Rails 5.2.x
-          - ruby_version: jruby
-            gemfile: gemfiles/Gemfile.rails-5.2.x
-
           # JRuby is not supported by Rails 7.0.x
           - ruby_version: jruby
             gemfile: gemfiles/Gemfile.rails-7.0.x
@@ -61,7 +37,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
diff --git a/README.md b/README.md
index 1d174ddc..7b7a6bca 100644
--- a/README.md
+++ b/README.md
@@ -13,10 +13,14 @@ Currently maintained by @radar.
 
 You will most commonly use this library within a Rails app.
 
+We support Rails versions from 6.0 and up.
+
 [See the Rails Guide](https://guides.rubyonrails.org/i18n.html) for an example of its usage.
 
 ### Ruby (without Rails)
 
+We support Ruby versions from 3.0 and up.
+
 If you want to use this library without Rails, you can simply add `i18n` to your `Gemfile`:
 
 ```ruby
diff --git a/gemfiles/Gemfile.rails-5.0.x b/gemfiles/Gemfile.rails-5.0.x
deleted file mode 100644
index 5428e594..00000000
--- a/gemfiles/Gemfile.rails-5.0.x
+++ /dev/null
@@ -1,13 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec :path => '..'
-
-gem 'activesupport', '~> 5.0.0'
-gem 'mocha', '~> 2.1.0'
-gem 'test_declarative', '0.0.6'
-gem 'rake', '~> 13'
-gem 'minitest', '~> 5.14'
-
-platforms :mri do
-  gem 'oj'
-end
diff --git a/gemfiles/Gemfile.rails-5.2.x b/gemfiles/Gemfile.rails-5.2.x
deleted file mode 100644
index 854d4fe7..00000000
--- a/gemfiles/Gemfile.rails-5.2.x
+++ /dev/null
@@ -1,13 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec :path => '..'
-
-gem 'activesupport', '~> 5.2.0'
-gem 'mocha', '~> 2.1.0'
-gem 'test_declarative', '0.0.6'
-gem 'rake'
-gem 'minitest', '~> 5.14'
-
-platforms :mri do
-  gem 'oj'
-end
diff --git a/gemfiles/Gemfile.rails-5.1.x b/gemfiles/Gemfile.rails-7.1.x
similarity index 73%
rename from gemfiles/Gemfile.rails-5.1.x
rename to gemfiles/Gemfile.rails-7.1.x
index a944b7a2..f427a474 100644
--- a/gemfiles/Gemfile.rails-5.1.x
+++ b/gemfiles/Gemfile.rails-7.1.x
@@ -2,8 +2,8 @@ source 'https://rubygems.org'
 
 gemspec :path => '..'
 
-gem 'activesupport', '~> 5.1.0'
-gem 'mocha', '~> 2.1.0'
+gem 'activesupport', '~> 7.1'
+gem 'mocha', '~> 2'
 gem 'test_declarative', '0.0.6'
 gem 'rake'
 gem 'minitest', '~> 5.14'
diff --git a/i18n.gemspec b/i18n.gemspec
index 2bfad5be..4d94dbbc 100644
--- a/i18n.gemspec
+++ b/i18n.gemspec
@@ -27,5 +27,6 @@ Gem::Specification.new do |s|
   s.required_ruby_version = '>= 2.3.0'
 
   s.add_dependency 'concurrent-ruby', '~> 1.0'
+  s.add_dependency 'racc', '~> 1.7'
 
 end