diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b692391..d9f39b0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,12 +18,12 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - '2.5'
-          - '2.6'
+          - '2.7'
         gemfile:
           - gemfiles/rails_61.gemfile
           - gemfiles/rails_60.gemfile
           - gemfiles/rails_52.gemfile
+          - gemfiles/rails_51.gemfile
         include:
           # ruby 3.x
           - ruby: '3.2'
@@ -32,13 +32,6 @@ jobs:
             gemfile: gemfiles/rails_61.gemfile
           - ruby: '3.0'
             gemfile: gemfiles/rails_60.gemfile
-          # old rails
-          - ruby: '2.5'
-            gemfile: gemfiles/rails_51.gemfile
-          - ruby: '2.5'
-            gemfile: gemfiles/rails_50.gemfile
-          - ruby: '2.5'
-            gemfile: gemfiles/rails_42.gemfile
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/${{ matrix.gemfile }}
     steps:
diff --git a/Appraisals b/Appraisals
index 4bb525f..019d01b 100644
--- a/Appraisals
+++ b/Appraisals
@@ -27,13 +27,3 @@ appraise 'rails-51' do
   gem 'actionpack', '~> 5.1.0'
   gem 'railties', '~> 5.1.0'
 end
-
-appraise 'rails-50' do
-  gem 'actionpack', '~> 5.0.0'
-  gem 'railties', '~> 5.0.0'
-end
-
-appraise 'rails-42' do
-  gem 'actionpack', '~> 4.2.0'
-  gem 'railties', '~> 4.2.0'
-end
diff --git a/gemfiles/rails_42.gemfile b/gemfiles/rails_42.gemfile
deleted file mode 100644
index 73af28c..0000000
--- a/gemfiles/rails_42.gemfile
+++ /dev/null
@@ -1,21 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "actionpack", "~> 4.2.0"
-gem "railties", "~> 4.2.0"
-
-group :development do
-  gem "appraisal", "~> 2.2"
-  gem "pry", "~> 0.14.1"
-  gem "pry-byebug", "~> 3.10.1"
-  gem "sdoc", "~> 2.0.3"
-  gem "telegram-bot-types", "~> 0.6.3"
-  gem "rspec", "~> 3.12.0"
-  gem "rspec-its", "~> 1.3.0"
-  gem "rspec-rails", "~> 4.0.2"
-  gem "rubocop", "~> 0.52.1"
-  gem "coveralls", "~> 0.8.23", require: false
-end
-
-gemspec path: "../"
diff --git a/gemfiles/rails_50.gemfile b/gemfiles/rails_50.gemfile
deleted file mode 100644
index 70ebbce..0000000
--- a/gemfiles/rails_50.gemfile
+++ /dev/null
@@ -1,21 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "actionpack", "~> 5.0.0"
-gem "railties", "~> 5.0.0"
-
-group :development do
-  gem "appraisal", "~> 2.2"
-  gem "pry", "~> 0.14.1"
-  gem "pry-byebug", "~> 3.10.1"
-  gem "sdoc", "~> 2.0.3"
-  gem "telegram-bot-types", "~> 0.6.3"
-  gem "rspec", "~> 3.12.0"
-  gem "rspec-its", "~> 1.3.0"
-  gem "rspec-rails", "~> 4.0.2"
-  gem "rubocop", "~> 0.52.1"
-  gem "coveralls", "~> 0.8.23", require: false
-end
-
-gemspec path: "../"