diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 9abb6e9..9dba7cb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
         ruby-version: ['3.1', '3.2']
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
@@ -30,25 +30,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        gemfile: ['6.0_stable', '6.1_stable', '7.0_stable', '7.1_stable']
-        ruby-version: ['2.5', '2.6', '2.7', '3.0', '3.1', '3.2']
-        exclude:
-          - ruby-version: '3.2'
-            gemfile: '6.0_stable'
-          - ruby-version: '3.1'
-            gemfile: '6.0_stable'
-          - ruby-version: '2.5'
-            gemfile: '7.0_stable'
-          - ruby-version: '2.6'
-            gemfile: '7.0_stable'
-          - ruby-version: '2.5'
-            gemfile: '7.1_stable'
-          - ruby-version: '2.6'
-            gemfile: '7.1_stable'
+        gemfile: ['6.1_stable', '7.0_stable', '7.1_stable']
+        ruby-version: ['3.1', '3.2', '3.3']
     env:
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
diff --git a/.rubocop.yml b/.rubocop.yml
index 070a4ea..b68ef0b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -13,7 +13,7 @@ AllCops:
     - 'vendor/**/*'
     - 'gemfiles/**/*'
     - Gemfile
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 3.1
   DisplayCopNames: true
 
 Bundler:
diff --git a/Appraisals b/Appraisals
index 254da18..c1f4199 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,17 +1,16 @@
 # frozen_string_literal: true
 
-appraise '6.0-stable' do
-  gem 'activerecord', '~> 6.0.0'
-end
-
 appraise '6.1-stable' do
   gem 'activerecord', '~> 6.1.0'
+  gem 'sqlite3', '~> 1.7.0'
 end
 
 appraise '7.0-stable' do
   gem 'activerecord', '~> 7.0.0'
+  gem 'sqlite3', '~> 1.7.0'
 end
 
 appraise '7.1-stable' do
   gem 'activerecord', '~> 7.1.0'
+  gem 'sqlite3', '~> 1.7.0'
 end
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 73597c3..e74e218 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Next Version
 
+* **Breaking Changes** Rails 6.0 is no longer supported. #28
+
 ## 1.0.0
 
 * **Breaking Changes** Rails 5.0, 5.1 and 5.2 are no longer supported. #23
diff --git a/active_record_bitmask.gemspec b/active_record_bitmask.gemspec
index 3765676..6f34c69 100644
--- a/active_record_bitmask.gemspec
+++ b/active_record_bitmask.gemspec
@@ -14,7 +14,7 @@ Gem::Specification.new do |spec|
   spec.summary       = 'Simple bitmask attribute support for ActiveRecord'
   spec.homepage      = 'https://github.com/alpaca-tc/active_record_bitmask'
 
-  spec.required_ruby_version = '>= 2.5.0'
+  spec.required_ruby_version = '>= 3.1.0'
 
   spec.metadata = {
     'homepage_uri' => 'https://github.com/alpaca-tc/active_record_bitmask',
@@ -28,5 +28,5 @@ Gem::Specification.new do |spec|
   end
   spec.require_paths = ['lib']
 
-  spec.add_dependency 'activerecord', '>= 6.0'
+  spec.add_dependency 'activerecord', '>= 6.1'
 end
diff --git a/gemfiles/5.0_stable.gemfile b/gemfiles/5.0_stable.gemfile
deleted file mode 100644
index e36e5b4..0000000
--- a/gemfiles/5.0_stable.gemfile
+++ /dev/null
@@ -1,13 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "pry"
-gem "rubocop", "0.86.0"
-gem "appraisal"
-gem "rake"
-gem "rspec"
-gem "sqlite3", "~> 1.3.6"
-gem "activerecord", "~> 5.0.0"
-
-gemspec path: "../"
diff --git a/gemfiles/5.1_stable.gemfile b/gemfiles/5.1_stable.gemfile
deleted file mode 100644
index 81fb981..0000000
--- a/gemfiles/5.1_stable.gemfile
+++ /dev/null
@@ -1,13 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "pry"
-gem "rubocop", "0.86.0"
-gem "appraisal"
-gem "rake"
-gem "rspec"
-gem "sqlite3"
-gem "activerecord", "~> 5.1.0"
-
-gemspec path: "../"
diff --git a/gemfiles/5.2_stable.gemfile b/gemfiles/5.2_stable.gemfile
deleted file mode 100644
index ee1c52d..0000000
--- a/gemfiles/5.2_stable.gemfile
+++ /dev/null
@@ -1,13 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "pry"
-gem "rubocop", "0.86.0"
-gem "appraisal"
-gem "rake"
-gem "rspec"
-gem "sqlite3"
-gem "activerecord", "~> 5.2.0"
-
-gemspec path: "../"
diff --git a/gemfiles/6.0_stable.gemfile b/gemfiles/6.0_stable.gemfile
deleted file mode 100644
index 1488f8d..0000000
--- a/gemfiles/6.0_stable.gemfile
+++ /dev/null
@@ -1,13 +0,0 @@
-# This file was generated by Appraisal
-
-source "https://rubygems.org"
-
-gem "pry"
-gem "rubocop", "1.28.2"
-gem "appraisal"
-gem "rake"
-gem "rspec"
-gem "sqlite3"
-gem "activerecord", "~> 6.0.0"
-
-gemspec path: "../"
diff --git a/gemfiles/6.1_stable.gemfile b/gemfiles/6.1_stable.gemfile
index cc536b6..e6d5b82 100644
--- a/gemfiles/6.1_stable.gemfile
+++ b/gemfiles/6.1_stable.gemfile
@@ -7,7 +7,7 @@ gem "rubocop", "1.28.2"
 gem "appraisal"
 gem "rake"
 gem "rspec"
-gem "sqlite3"
+gem "sqlite3", "~> 1.7.0"
 gem "activerecord", "~> 6.1.0"
 
 gemspec path: "../"
diff --git a/gemfiles/7.0_stable.gemfile b/gemfiles/7.0_stable.gemfile
index aee4d3b..fb5e465 100644
--- a/gemfiles/7.0_stable.gemfile
+++ b/gemfiles/7.0_stable.gemfile
@@ -7,7 +7,7 @@ gem "rubocop", "1.28.2"
 gem "appraisal"
 gem "rake"
 gem "rspec"
-gem "sqlite3"
+gem "sqlite3", "~> 1.7.0"
 gem "activerecord", "~> 7.0.0"
 
 gemspec path: "../"
diff --git a/gemfiles/7.1_stable.gemfile b/gemfiles/7.1_stable.gemfile
index ce852d7..0073819 100644
--- a/gemfiles/7.1_stable.gemfile
+++ b/gemfiles/7.1_stable.gemfile
@@ -7,7 +7,7 @@ gem "rubocop", "1.28.2"
 gem "appraisal"
 gem "rake"
 gem "rspec"
-gem "sqlite3"
+gem "sqlite3", "~> 1.7.0"
 gem "activerecord", "~> 7.1.0"
 
 gemspec path: "../"
diff --git a/lib/active_record_bitmask/model.rb b/lib/active_record_bitmask/model.rb
index 550f262..d6caf1d 100644
--- a/lib/active_record_bitmask/model.rb
+++ b/lib/active_record_bitmask/model.rb
@@ -51,21 +51,16 @@ def bitmask_for(attribute)
       private
 
       def define_bitmask_attribute(attribute, map)
-        if ActiveRecord.gem_version >= Gem::Version.new('7.0.0.alpha1')
+        if ActiveRecord.gem_version >= Gem::Version.new('7.0.0')
           # Greater than or equal to 7.0.0
           attribute(attribute) do |subtype|
             ActiveRecordBitmask::BitmaskType.new(attribute, map, subtype)
           end
-        elsif ActiveRecord.gem_version >= Gem::Version.new('6.1.0')
+        else
           # Equal to 6.1.0
           decorate_attribute_type(attribute) do |subtype|
             ActiveRecordBitmask::BitmaskType.new(attribute, map, subtype)
           end
-        else
-          # Less than 6.1.0
-          decorate_attribute_type(attribute, :bitmask) do |subtype|
-            ActiveRecordBitmask::BitmaskType.new(attribute, map, subtype)
-          end
         end
       end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e8e47b8..5c40f8c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -29,4 +29,4 @@
   end
 end
 
-Dir['./spec/support/**/*.rb'].sort.each { |f| require f }
+Dir['./spec/support/**/*.rb'].each { |f| require f }