diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0b59fb1
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,79 @@
+# .github/workflows/ci.yml
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    env:
+      NOKOGIRI_USE_SYSTEM_LIBRARIES: true
+    services:
+      postgres:
+        image: postgres
+        env:
+          POSTGRES_PASSWORD: postgres
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          - 5432:5432
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - gemfile: 6.0.gemfile
+            ruby: 2.7
+
+          - gemfile: 6.0.gemfile
+            ruby: 3.0
+
+          - gemfile: 6.0.gemfile
+            ruby: 3.1
+
+          - gemfile: 6.1.gemfile
+            ruby: 2.7
+
+          - gemfile: 6.1.gemfile
+            ruby: 3.0
+
+          - gemfile: 6.1.gemfile
+            ruby: 3.1
+
+          - gemfile: 7.0.gemfile
+            ruby: 2.7
+
+          - gemfile: 7.0.gemfile
+            ruby: 3.0
+
+          - gemfile: 7.0.gemfile
+            ruby: 3.1
+
+    name: ${{ matrix.gemfile }}, ruby ${{ matrix.ruby }}
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+
+      - name: Bundle install
+        run: |
+          bundle config set gemfile "${GITHUB_WORKSPACE}/gemfiles/${{ matrix.gemfile }}"
+          bundle install --jobs 4 --retry 3
+
+      - name: Run tests
+        run: bundle exec rspec
+        env:
+          DB_HOST: localhost
+          DB_USERNAME: postgres
+          DB_PORT: 5432
+          DB_PASSWORD: postgres
+
+      - name: Rubocop
+        run: bundle exec rubocop
diff --git a/.gitignore b/.gitignore
index 5615ba4..34f1ec3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,7 +10,7 @@ spec/internal/log/
 /test/tmp/
 /test/version_tmp/
 /tmp/
-Gemfile.lock
+*.lock
 
 # Used by dotenv library to load environment variables.
 # .env
@@ -50,3 +50,7 @@ build-iPhoneSimulator/
 
 # unless supporting rvm < 1.11.0 or doing something fancy, ignore this:
 .rvmrc
+
+.idea
+.rspec_status
+gemfiles/.bundle/
diff --git a/.rubocop.yml b/.rubocop.yml
index 9a73842..6e0c1bd 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,7 +1,7 @@
 require: rubocop-rspec
 
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.7
   TargetRailsVersion: 4.0
   Exclude:
     - 'activerecord-data_integrity.gemspec'
@@ -9,6 +9,7 @@ AllCops:
     - 'tmp/**/*'
     - 'gemfiles/*'
     - 'spec/internal/**/*'
+    - 'vendor/**/*'
 
 Metrics/LineLength:
   Max: 110
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index f709866..0000000
--- a/.travis.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-sudo: require
-services:
-- docker
-install:
-- gem install dip
-before_script:
-- unset BUNDLE_GEMFILE
-- dip provision
-script:
-- dip rspec
-- dip rubocop
-deploy:
-  provider: rubygems
-  api_key:
-    secure: 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
-  gem: activerecord-data_integrity
-  on:
-    tags: true
-    repo: dsalahutdinov/activerecord-data_integrity
diff --git a/Appraisals b/Appraisals
index 5894052..208053f 100644
--- a/Appraisals
+++ b/Appraisals
@@ -1,13 +1,13 @@
 # frozen_string_literal: true
 
-appraise '5.0' do
-  gem 'activerecord', '~> 5.0'
+appraise '6.0' do
+  gem 'activerecord', '~> 6.0'
 end
 
-appraise '5.1' do
-  gem 'activerecord', '~> 5.1'
+appraise '6.1' do
+  gem 'activerecord', '~> 6.1'
 end
 
-appraise '5.2' do
-  gem 'activerecord', '~> 5.2'
+appraise '7.0' do
+  gem 'activerecord', '~> 7.0'
 end
diff --git a/README.md b/README.md
index 1036cf3..5447ed6 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 [![Gem Version](https://badge.fury.io/rb/activerecord-data_integrity.svg)](https://badge.fury.io/rb/activerecord-data_integrity)
-[![Build Status](https://travis-ci.org/dsalahutdinov/activerecord-data_integrity.svg?branch=master)](https://travis-ci.org/dsalahutdinov/activerecord-data_integrity.svg?branch=master)
+[![CI Status](https://github.com/dsalahutdinov/activerecord-data_integrity/workflows/CI/badge.svg?branch=master)](https://github.com/dsalahutdinov/activerecord-data_integrity/actions?query=workflow%3ACI+branch%3Amaster)
 
 # ActiveRecord::DataIntegrity
 
@@ -80,8 +80,8 @@ Otherwise (without Docker) set up environment manually:
 git checkout git@github.com:dsalahutdinov/activerecord-data_integrity.git
 cd activerecord-data_integrity
 bundle install
-bundle appraisal
-DB_HOST=localhost DB_NAME=testdb DB_USERNAME=postgres bundle appraisal rspec
+bundle exec appraisal
+DB_HOST=localhost DB_NAME=testdb DB_USERNAME=postgres bundle exec appraisal rspec
 ```
 
 ## License
diff --git a/activerecord-data_integrity.gemspec b/activerecord-data_integrity.gemspec
index 99a402c..fc4af54 100644
--- a/activerecord-data_integrity.gemspec
+++ b/activerecord-data_integrity.gemspec
@@ -32,14 +32,14 @@ Gem::Specification.new do |spec|
   spec.require_paths = ['lib']
 
   spec.add_runtime_dependency 'pg'
-  spec.add_runtime_dependency 'rails'
+  spec.add_runtime_dependency 'activerecord'
   spec.add_runtime_dependency 'rainbow'
 
-  spec.add_development_dependency 'appraisal', '~> 2.2'
-  spec.add_development_dependency 'bundler', '~> 1.16'
-  spec.add_development_dependency 'combustion', '~> 1.0'
-  spec.add_development_dependency 'rake', '~> 10.0'
-  spec.add_development_dependency 'rspec', '~> 3.0'
+  spec.add_development_dependency 'appraisal', '~> 2.4'
+  spec.add_development_dependency 'bundler', '~> 2.2'
+  spec.add_development_dependency 'combustion', '~> 1.3'
+  spec.add_development_dependency 'rake', '~> 13.0'
+  spec.add_development_dependency 'rspec', '~> 3.11'
 
   spec.add_development_dependency 'rubocop'
   spec.add_development_dependency 'rubocop-rspec'
diff --git a/gemfiles/6.0.gemfile b/gemfiles/6.0.gemfile
new file mode 100644
index 0000000..5b48be1
--- /dev/null
+++ b/gemfiles/6.0.gemfile
@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activerecord", "~> 6.0"
+
+gemspec path: "../"
diff --git a/gemfiles/6.1.gemfile b/gemfiles/6.1.gemfile
new file mode 100644
index 0000000..ed3beb6
--- /dev/null
+++ b/gemfiles/6.1.gemfile
@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activerecord", "~> 6.1"
+
+gemspec path: "../"
diff --git a/gemfiles/7.0.gemfile b/gemfiles/7.0.gemfile
new file mode 100644
index 0000000..9e840e5
--- /dev/null
+++ b/gemfiles/7.0.gemfile
@@ -0,0 +1,7 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "activerecord", "~> 7.0"
+
+gemspec path: "../"
diff --git a/lib/active_record/data_integrity.rb b/lib/active_record/data_integrity.rb
index 3eb91cd..1eef8b4 100644
--- a/lib/active_record/data_integrity.rb
+++ b/lib/active_record/data_integrity.rb
@@ -2,7 +2,7 @@
 
 require 'active_record/data_integrity/version'
 
-require 'rails/all'
+require 'active_record'
 require 'active_record/data_integrity/cli'
 require 'rainbow'
 
diff --git a/lib/active_record/data_integrity/config.rb b/lib/active_record/data_integrity/config.rb
index 74bdff6..fbc0937 100644
--- a/lib/active_record/data_integrity/config.rb
+++ b/lib/active_record/data_integrity/config.rb
@@ -14,18 +14,14 @@ def initialize(options)
       end
 
       def cops
-        @cops ||= begin
-          ActiveRecord::DataIntegrity::Cop.descendants.select do |cop|
-            only.empty? || cop.cop_name.in?(only)
-          end
+        @cops ||= ActiveRecord::DataIntegrity::Cop.descendants.select do |cop|
+          only.empty? || cop.cop_name.in?(only)
         end
       end
 
       def models
-        @models ||= begin
-          ActiveRecord::Base.descendants.select do |model|
-            model_names.empty? || model.name.in?(model_names)
-          end
+        @models ||= ActiveRecord::Base.descendants.select do |model|
+          model_names.empty? || model.name.in?(model_names)
         end
       end
     end
diff --git a/lib/active_record/data_integrity/cop/cop.rb b/lib/active_record/data_integrity/cop/cop.rb
index 7af3f00..c06955a 100644
--- a/lib/active_record/data_integrity/cop/cop.rb
+++ b/lib/active_record/data_integrity/cop/cop.rb
@@ -5,6 +5,7 @@ module DataIntegrity
     # Checking cop base class
     class Cop
       attr_reader :model
+
       delegate :connection, to: :model
 
       def initialize(model)
diff --git a/spec/internal/config/database.yml b/spec/internal/config/database.yml
index be24105..cf179c2 100644
--- a/spec/internal/config/database.yml
+++ b/spec/internal/config/database.yml
@@ -1,5 +1,7 @@
 test:
   adapter: postgresql
-  host: <%= ENV.fetch("DB_HOST") %>
-  database: <%= ENV.fetch("DB_NAME") %>
-  username: <%= ENV.fetch("DB_USERNAME") %>
+  host: <%= ENV.fetch("DB_HOST", "localhost") %>
+  database: <%= ENV.fetch("DB_NAME", "ar_di_test") %>
+  username: <%= ENV.fetch("DB_USERNAME", "postgres") %>
+  port: <%= ENV.fetch("DB_PORT", 5432) %>
+  password: <%= ENV.fetch("DB_PASSWORD", "") %>
diff --git a/spec/internal/db/migrate/20180102000000_create_belongs_to_tables.rb b/spec/internal/db/migrate/20180102000000_create_belongs_to_tables.rb
index 1c70783..f616e00 100644
--- a/spec/internal/db/migrate/20180102000000_create_belongs_to_tables.rb
+++ b/spec/internal/db/migrate/20180102000000_create_belongs_to_tables.rb
@@ -5,7 +5,6 @@ def change
     create_table :belongs_to_users, &:timestamps
 
     create_table :belongs_to_user_settings do |t|
-      t.integer :user_id
       t.references :user, foreign_key: { to_table: :belongs_to_users }
       t.text :data
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 3d26c25..53e1248 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -5,8 +5,12 @@
 require 'byebug'
 
 require 'combustion'
-Combustion.initialize! :all,
-                       database_reset: true, database_migrate: true, load_schema: false
+Combustion.initialize!(
+  :active_record,
+  database_reset: true,
+  database_migrate: true,
+  load_schema: false
+)
 
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure