diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 86b7ace..09854f3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -7,27 +7,15 @@ jobs:
     strategy:
       matrix:
         ruby_version:
-          - 2.7.8
-          - 3.0.7
           - 3.1.6
           - 3.2.6
           - 3.3.6
           - jruby-9.4.9.0
         gemfile:
-          - gemfiles/Gemfile.activesupport-5.x
-          - gemfiles/Gemfile.activesupport-6.x
           - gemfiles/Gemfile.activesupport-7.1.x
           - gemfiles/Gemfile.activesupport-7.2.x
           - gemfiles/Gemfile.activesupport-8.x
         exclude:
-            - gemfile: gemfiles/Gemfile.activesupport-7.2.x
-              ruby_version: 2.7.8
-            - gemfile: gemfiles/Gemfile.activesupport-7.2.x
-              ruby_version: 3.0.7
-            - gemfile: gemfiles/Gemfile.activesupport-8.x
-              ruby_version: 2.7.8
-            - gemfile: gemfiles/Gemfile.activesupport-8.x
-              ruby_version: 3.0.7
             - gemfile: gemfiles/Gemfile.activesupport-8.x
               ruby_version: 3.1.6
             - gemfile: gemfiles/Gemfile.activesupport-8.x
diff --git a/README.md b/README.md
index 873691d..c16c3b8 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,8 @@
 A modern ruby gem allowing to do time calculation with working hours.
 
 Compatible and tested with:
-- Ruby `2.7`, `3.0`, `3.1`, `3.2`, `3.3`, JRuby `9.4`
-- ActiveSupport `5.x`, `6.x`, `7.x`, `8.x`
+- Ruby `3.1`, `3.2`, `3.3`, JRuby `9.4`
+- ActiveSupport `7.x`, `8.x`
 
 ## Installation
 
diff --git a/gemfiles/Gemfile.activesupport-5.x b/gemfiles/Gemfile.activesupport-5.x
deleted file mode 100644
index baf22f3..0000000
--- a/gemfiles/Gemfile.activesupport-5.x
+++ /dev/null
@@ -1,5 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec :path => '..'
-
-gem 'activesupport', '~> 5.2'
diff --git a/gemfiles/Gemfile.activesupport-6.x b/gemfiles/Gemfile.activesupport-6.x
deleted file mode 100644
index 1cb6b87..0000000
--- a/gemfiles/Gemfile.activesupport-6.x
+++ /dev/null
@@ -1,5 +0,0 @@
-source 'https://rubygems.org'
-
-gemspec :path => '..'
-
-gem 'activesupport', '~> 6.1'
diff --git a/working_hours.gemspec b/working_hours.gemspec
index f001caa..3ded13f 100644
--- a/working_hours.gemspec
+++ b/working_hours.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
   spec.require_paths = ["lib"]
 
-  spec.add_dependency 'activesupport', '>= 3.2'
+  spec.add_dependency 'activesupport', '>= 7.0'
   spec.add_dependency 'tzinfo'
 
   spec.add_development_dependency 'bundler', '>= 1.5'