diff --git a/.github/workflows/rspec.yml b/.github/workflows/rspec.yml
index 186f90d..8cc0b59 100644
--- a/.github/workflows/rspec.yml
+++ b/.github/workflows/rspec.yml
@@ -7,12 +7,16 @@ jobs:
 
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        ruby-version: ['3.2', '3.1', '3.0', '2.7']
+
     steps:
       - uses: actions/checkout@v3
-      - name: Set up Ruby
+      - name: Set up Ruby ${{ matrix.ruby-version }}
         uses: ruby/setup-ruby@ec02537da5712d66d4d50a0f33b7eb52773b5ed1
         with:
-          ruby-version: '3.1'
+          ruby-version: ${{ matrix.ruby-version }}
       - name: Install dependencies
         run: bundle install
       - name: Installing all gem versions via Appraisal
diff --git a/.ruby-version b/.ruby-version
index ef538c2..0aec50e 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.2
+3.1.4
diff --git a/.tool-versions b/.tool-versions
new file mode 100644
index 0000000..306ab33
--- /dev/null
+++ b/.tool-versions
@@ -0,0 +1 @@
+ruby 3.1.4
diff --git a/Appraisals b/Appraisals
index 4e033fe..892c575 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,15 +1,3 @@
-appraise "rails-5.0" do
-  gem "railties", "~>5.0.0"
-end
-
-appraise "rails-5.1" do
-  gem "railties", "~>5.1.0"
-end
-
-appraise "rails-5.2" do
-  gem "railties", "~>5.2.0"
-end
-
 appraise "rails-6.0" do
   gem "railties", "~>6.0.0"
 end
diff --git a/cache_crispies.gemspec b/cache_crispies.gemspec
index e660a18..5728327 100644
--- a/cache_crispies.gemspec
+++ b/cache_crispies.gemspec
@@ -11,18 +11,21 @@ Gem::Specification.new do |spec|
   spec.summary       = 'Fast Rails serializer with built-in caching'
   spec.homepage      = 'https://github.com/codenoble/cache-crispies'
   spec.licenses      = ['MIT']
+  spec.metadata          = { 'source_code_uri' => 'https://github.com/example/example' }
 
   spec.files         = Dir.glob('{lib,spec}/**/*') + ['.rspec']
   spec.test_files    = spec.files.grep(%r{^(spec)/})
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'railties', '>= 5.0.0', '< 8.0'
+  spec.required_ruby_version = '>= 2.7.0'
+
+  spec.add_dependency 'railties', '>= 6.0.0', '< 8.0'
   spec.add_dependency 'oj', '~> 3.7'
 
-  spec.add_development_dependency 'activemodel', '>= 5.0.0', '< 8.0'
-  spec.add_development_dependency 'appraisal', '~> 2.2'
+  spec.add_development_dependency 'activemodel', '>= 6.0.0', '< 8.0'
+  spec.add_development_dependency 'appraisal', '~> 2.4'
   spec.add_development_dependency 'bundler', '~> 2.0'
-  spec.add_development_dependency 'byebug', '~> 11.0'
+  spec.add_development_dependency 'debug', '~> 1.8'
   spec.add_development_dependency 'rspec', '~> 3.12.0'
   spec.add_development_dependency 'rspec_junit_formatter', '~> 0.4'
   spec.add_development_dependency 'simplecov', '~> 0.22'
diff --git a/gemfiles/rails_5.0.gemfile b/gemfiles/rails_5.0.gemfile
deleted file mode 100644
index d3ee48c..0000000
--- a/gemfiles/rails_5.0.gemfile
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "railties", "~>5.0.0"
-
-gemspec path: "../"
diff --git a/gemfiles/rails_5.1.gemfile b/gemfiles/rails_5.1.gemfile
deleted file mode 100644
index a2c96ac..0000000
--- a/gemfiles/rails_5.1.gemfile
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "railties", "~>5.1.0"
-
-gemspec path: "../"
diff --git a/gemfiles/rails_5.2.gemfile b/gemfiles/rails_5.2.gemfile
deleted file mode 100644
index aada12c..0000000
--- a/gemfiles/rails_5.2.gemfile
+++ /dev/null
@@ -1,7 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "railties", "~>5.2.0"
-
-gemspec path: "../"
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 80baa14..6df6b18 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -17,7 +17,6 @@
   )
 end
 
-require 'byebug'
 require_relative '../lib/cache_crispies'
 
 RSpec.configure do |config|