diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 00000000..3a630cf6
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,220 @@
+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ['2.7', '3.0', '3.1', 'jruby-9.3']
+        gemfile:
+          - gemfiles/mysql2/6-0.gemfile
+          - gemfiles/postgresql/6-0.gemfile
+          - gemfiles/sqlite3/6-0.gemfile
+          - gemfiles/mysql2/6-1.gemfile
+          - gemfiles/postgresql/6-1.gemfile
+          - gemfiles/sqlite3/6-1.gemfile
+          - gemfiles/mysql2/7-0.gemfile
+          - gemfiles/postgresql/7-0.gemfile
+          - gemfiles/sqlite3/7-0.gemfile
+        include:
+          #
+          # The future
+          #
+          # Active Record head
+          - ruby: '2.7'
+            gemfile: gemfiles/mysql2/master.gemfile
+          - ruby: '2.7'
+            gemfile: gemfiles/postgresql/master.gemfile
+          - ruby: '2.7'
+            gemfile: gemfiles/sqlite3/master.gemfile
+          - ruby: '3.0'
+            gemfile: gemfiles/mysql2/master.gemfile
+          - ruby: '3.0'
+            gemfile: gemfiles/postgresql/master.gemfile
+          - ruby: '3.0'
+            gemfile: gemfiles/sqlite3/master.gemfile
+          - ruby: '3.1'
+            gemfile: gemfiles/mysql2/master.gemfile
+          - ruby: '3.1'
+            gemfile: gemfiles/postgresql/master.gemfile
+          - ruby: '3.1'
+            gemfile: gemfiles/sqlite3/master.gemfile
+          # MRI Ruby head
+          - ruby: head
+            gemfile: gemfiles/mysql2/master.gemfile
+          - ruby: head
+            gemfile: gemfiles/postgresql/master.gemfile
+          - ruby: head
+            gemfile: gemfiles/sqlite3/master.gemfile
+          - ruby: head
+            gemfile: gemfiles/mysql2/7-0.gemfile
+          - ruby: head
+            gemfile: gemfiles/postgresql/7-0.gemfile
+          - ruby: head
+            gemfile: gemfiles/sqlite3/7-0.gemfile
+          # JRuby head
+          - ruby: jruby-head
+            gemfile: gemfiles/mysql2/6-1.gemfile
+          - ruby: jruby-head
+            gemfile: gemfiles/postgresql/6-1.gemfile
+          - ruby: jruby-head
+            gemfile: gemfiles/sqlite3/6-1.gemfile
+
+          #
+          # Current
+          #
+          # MRI Ruby 2.6
+          - ruby: '2.6'
+            gemfile: gemfiles/mysql2/6-0.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/postgresql/6-0.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/sqlite3/6-0.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/mysql2/6-1.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/postgresql/6-1.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/sqlite3/6-1.gemfile
+          # Rails 5.2
+          - ruby: '2.6'
+            gemfile: gemfiles/mysql2/5-2.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/postgresql/5-2.gemfile
+          - ruby: '2.6'
+            gemfile: gemfiles/sqlite3/5-2.gemfile
+          - ruby: '2.7'
+            gemfile: gemfiles/mysql2/5-2.gemfile
+          - ruby: '2.7'
+            gemfile: gemfiles/postgresql/5-2.gemfile
+          - ruby: '2.7'
+            gemfile: gemfiles/sqlite3/5-2.gemfile
+          - ruby: 'jruby-9.2'
+            gemfile: gemfiles/mysql2/5-2.gemfile
+          - ruby: 'jruby-9.2'
+            gemfile: gemfiles/postgresql/5-2.gemfile
+          - ruby: 'jruby-9.2'
+            gemfile: gemfiles/sqlite3/5-2.gemfile
+
+          #
+          # The past
+          #
+          # EOL Active Record
+          # Rails 3.2 was maintained longer and is ruby 2.2 compatible
+          - ruby: '2.2'
+            gemfile: gemfiles/postgresql/3-2.gemfile
+          - ruby: '2.2'
+            gemfile: gemfiles/sqlite3/3-2.gemfile
+          # Rails <= 4.0 was only compatible with ruby 2.0
+          # The test were running, but there are known incompatibilites
+          - ruby: 2.0.0
+            gemfile: gemfiles/postgresql/3-0.gemfile
+          - ruby: 2.0.0
+            gemfile: gemfiles/sqlite3/3-0.gemfile
+          - ruby: 2.0.0
+            gemfile: gemfiles/postgresql/3-1.gemfile
+          - ruby: 2.0.0
+            gemfile: gemfiles/sqlite3/3-1.gemfile
+          - ruby: 2.0.0
+            gemfile: gemfiles/postgresql/4-0.gemfile
+          - ruby: 2.0.0
+            gemfile: gemfiles/sqlite3/4-0.gemfile
+          # Rails 4.1 was only compatible with ruby 2.1
+          - ruby: '2.1'
+            gemfile: gemfiles/postgresql/4-1.gemfile
+          - ruby: '2.1'
+            gemfile: gemfiles/sqlite3/4-1.gemfile
+          # Rails 4.2 was EOL with the release of 6.0 and compatible with ruby 2.4
+          - ruby: '2.4'
+            gemfile: gemfiles/mysql2/4-2.gemfile
+          - ruby: '2.4'
+            gemfile: gemfiles/postgresql/4-2.gemfile
+          - ruby: '2.4'
+            gemfile: gemfiles/sqlite3/4-2.gemfile
+          # Rails 5.0 was EOL with the release of 5.2 and compatible with ruby 2.4
+          - ruby: '2.4'
+            gemfile: gemfiles/mysql2/5-0.gemfile
+          - ruby: '2.4'
+            gemfile: gemfiles/postgresql/5-0.gemfile
+          - ruby: '2.4'
+            gemfile: gemfiles/sqlite3/5-0.gemfile
+          # Rails 5.1 was EOL with the release of 6.0 and compatible with ruby 2.5
+          - ruby: '2.5'
+            gemfile: gemfiles/mysql2/5-1.gemfile
+          - ruby: '2.5'
+            gemfile: gemfiles/postgresql/5-1.gemfile
+          - ruby: '2.5'
+            gemfile: gemfiles/sqlite3/5-1.gemfile
+
+          #
+          # The parallel dimension
+          #
+          # Rubinius (Isn't supported on Github Actions)
+          # - rvm: rbx-2
+          #   gemfile: gemfiles/mysql2/6-0.gemfile
+          # - rvm: rbx-2
+          #   gemfile: gemfiles/postgresql/6-0.gemfile
+          # - rvm: rbx-2
+          #   gemfile: gemfiles/sqlite3/6-0.gemfile
+    continue-on-error: ${{ endsWith(matrix.gemfile, 'master.gemfile') || endsWith(matrix.ruby, 'head') }}
+    services:
+      postgres:
+        # AR before 4.2.6 doesn't work with 12
+        image: postgres:11-alpine
+        # Provide the password for postgres
+        env:
+          POSTGRES_DB: delayed_job_test
+          POSTGRES_PASSWORD: postgres
+        # Set health checks to wait until postgres has started
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+        ports:
+          # Maps tcp port 5432 on service container to the host
+          - 5432:5432
+      mysql:
+        image: mysql:5.7
+        env:
+          MYSQL_ALLOW_EMPTY_PASSWORD: yes
+          MYSQL_DATABASE: delayed_job_test
+        ports:
+            - 3306:3306
+        options: --health-cmd="mysqladmin ping" --health-interval=10s --health-timeout=5s --health-retries=3
+
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      env:
+        BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - name: Run tests
+      env:
+        BUNDLE_GEMFILE: ${{ matrix.gemfile }}
+      run: bundle exec rspec
+    - name: Coveralls Parallel
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.github_token }}
+        flag-name: run-${{ matrix.ruby }}-${{ matrix.gemfile }}
+        parallel: true
+
+  finish:
+    needs: test
+    runs-on: ubuntu-latest
+    steps:
+    - name: Coveralls Finished
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.github_token }}
+        parallel-finished: true
diff --git a/.github/workflows/rubocop.yml b/.github/workflows/rubocop.yml
new file mode 100644
index 00000000..7519676e
--- /dev/null
+++ b/.github/workflows/rubocop.yml
@@ -0,0 +1,30 @@
+name: RuboCop
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Ruby 2.7
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: 2.7
+    - name: Generate lockfile for cache key
+      run: bundle lock
+    - name: Cache gems
+      uses: actions/cache@v1
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-rubocop-${{ hashFiles('**/Gemfile.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-rubocop-
+    - name: Install gems
+      run: |
+        bundle config path vendor/bundle
+        bundle config set without 'default test'
+        bundle install --jobs 4 --retry 3
+    - name: Run RuboCop
+      run: bundle exec rubocop --parallel
diff --git a/.rubocop.yml b/.rubocop.yml
index 48e569cc..bb1eab8e 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,5 +1,8 @@
-# Load the rubocop-rspec gem
-require: rubocop-rspec
+require:
+  - rubocop-packaging
+  - rubocop-performance
+  - rubocop-rails
+  - rubocop-rspec
 
 Rails:
   Enabled: true
@@ -7,6 +10,8 @@ AllCops:
   Exclude:
     - lib/**/templates/*
     - vendor/**/*
+  NewCops: enable
+  SuggestExtensions: false
 
 #################
 # [i] Overrides #
@@ -29,30 +34,32 @@ Style/EmptyMethod:
   EnforcedStyle: expanded
 
 # Align ends correctly.
-EndAlignment:
+Layout/EndAlignment:
   EnforcedStyleAlignWith: variable
 
-LineLength:
+Layout/LineLength:
   Max: 120
 
-SignalException:
+Style/SignalException:
   EnforcedStyle: only_raise
 
-SpaceInsideBlockBraces:
+Layout/SpaceInsideBlockBraces:
   SpaceBeforeBlockParameters: true
 
-SpaceInsideHashLiteralBraces:
+Layout/SpaceInsideHashLiteralBraces:
   EnforcedStyle: space
 
-BracesAroundHashParameters:
-  EnforcedStyle: context_dependent
-
-StringLiterals:
+Style/StringLiterals:
   EnforcedStyle: double_quotes
 
 #################
 # Disabled cops #
 #################
+# We actually still work with ruby 2.0 but this setting only supports 2.4+
+# We aren't going to drop old versions just to make rubocop happy.
+Gemspec/RequiredRubyVersion:
+  Enabled: false
+
 Metrics/ClassLength:
   Enabled: false
 
@@ -77,6 +84,9 @@ Style/FormatString:
 Style/Lambda:
   Enabled: false
 
+Style/MultipleComparison:
+  Enabled: false
+
 Style/NegatedIf:
   Enabled: false
 
@@ -101,6 +111,9 @@ Style/WordArray:
 Rails/HasAndBelongsToMany:
   Enabled: false
 
+Rails/RakeEnvironment:
+  Enabled: false
+
 # enforces using the class name in a describe block (e.g. `describe TestedClass do`)
 RSpec/DescribeClass:
   Enabled: false
@@ -123,12 +136,15 @@ RSpec/MessageExpectation:
 RSpec/MultipleExpectations:
   Enabled: false
 
+RSpec/MultipleMemoizedHelpers:
+  Enabled: false
+
 # enforces rules about how many nested `describe` blocks are allowed
 RSpec/NestedGroups:
   Enabled: false
 
 # enforces rules about using `it` or `describe` block methods instead of `feature` or `scenario`
-Capybara/FeatureMethods:
+RSpec/Capybara/FeatureMethods:
   Enabled: false
 
 ###################
@@ -149,3 +165,8 @@ Style/FormatStringToken:
 
 Style/NumericPredicate:
   Enabled: false
+
+# We still allow really old versions of Ruby and Rails
+# While I like the safe navigator, we don't want to use it here just yet
+Style/SafeNavigation:
+  Enabled: false
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 88be7086..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,155 +0,0 @@
-language: ruby
-branches:
-  only:
-    - master
-before_script:
-  - mysql -e 'create database delayed_job_test;'
-  - mysql --version
-  - psql -c 'create database delayed_job_test;' -U postgres
-script: bundle exec $COMMAND
-env:
-  global:
-    - JRUBY_OPTS="$JRUBY_OPTS -Xcli.debug=true --debug"
-    - COMMAND=rspec
-gemfile: # Supported
-  - gemfiles/mysql2/4-2.gemfile
-  - gemfiles/mysql2/5-1.gemfile
-  - gemfiles/mysql2/5-2.gemfile
-  - gemfiles/postgresql/4-2.gemfile
-  - gemfiles/postgresql/5-1.gemfile
-  - gemfiles/postgresql/5-2.gemfile
-  - gemfiles/sqlite3/4-2.gemfile
-  - gemfiles/sqlite3/5-1.gemfile
-  - gemfiles/sqlite3/5-2.gemfile
-rvm: # Supported
-  - 2.2.10
-  - 2.3.7
-  - 2.4.4
-  - jruby-9.1.8.0
-
-jdk: oraclejdk8
-
-matrix:
-  allow_failures:
-    - rvm: jruby-head # Future
-    - rvm: rbx-2 # Parallel dimension
-    - rvm: ruby-head # Future
-    - gemfile: gemfiles/mysql2/master.gemfile # Future
-    - gemfile: gemfiles/postgresql/master.gemfile # Future
-    - gemfile: gemfiles/sqlite3/master.gemfile # Future
-    # The two combinations below are currently broken. We should stop allowing
-    # failure as the issue is resolved. See:
-    # https://github.com/jruby/activerecord-jdbc-adapter/issues/700
-    - rvm: jruby-9.1.8.0
-      gemfile: gemfiles/mysql2/5-1.gemfile
-    - rvm: jruby-9.1.8.0
-      gemfile: gemfiles/postgresql/5-1.gemfile
-    - rvm: jruby-9.1.8.0
-      gemfile: gemfiles/mysql2/5-2.gemfile
-    - rvm: jruby-9.1.8.0
-      gemfile: gemfiles/postgresql/5-2.gemfile
-    - rvm: jruby-9.1.8.0
-      gemfile: gemfiles/sqlite3/5-2.gemfile
-
-  include:
-    #
-    # Rubocop
-    #
-    - rvm: 2.5.1
-      gemfile: Gemfile
-      env:
-        - COMMAND=rubocop
-    #
-    # The future
-    #
-    # MRI 2.5.1
-    - rvm: 2.5.1
-      gemfile: gemfiles/mysql2/5-1.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/postgresql/5-1.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/sqlite3/5-1.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/mysql2/5-2.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/postgresql/5-2.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/sqlite3/5-2.gemfile
-    # Active Record head
-    - rvm: 2.5.1
-      gemfile: gemfiles/mysql2/master.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/postgresql/master.gemfile
-    - rvm: 2.5.1
-      gemfile: gemfiles/sqlite3/master.gemfile
-    # MRI Ruby head
-    - rvm: ruby-head
-      gemfile: gemfiles/mysql2/5-2.gemfile
-    - rvm: ruby-head
-      gemfile: gemfiles/postgresql/5-2.gemfile
-    - rvm: ruby-head
-      gemfile: gemfiles/sqlite3/5-2.gemfile
-    # JRuby head
-    - rvm: jruby-head
-      gemfile: gemfiles/mysql2/5-2.gemfile
-    - rvm: jruby-head
-      gemfile: gemfiles/postgresql/5-2.gemfile
-    - rvm: jruby-head
-      gemfile: gemfiles/sqlite3/5-2.gemfile
-    #
-    # The past
-    #
-    # EOL Active Record
-    # Rails 3.2 was maintained longer and is ruby 2.2 compatible
-    - rvm: 2.2.10
-      gemfile: gemfiles/mysql2/3-2.gemfile
-    - rvm: 2.2.10
-      gemfile: gemfiles/postgresql/3-2.gemfile
-    - rvm: 2.2.10
-      gemfile: gemfiles/sqlite3/3-2.gemfile
-    # Rails <= 4.0 was only compatible with ruby 2.0
-    # The test were running, but there are known incompatibilites
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/mysql2/3-0.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/mysql2/3-1.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/postgresql/3-0.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/postgresql/3-1.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/sqlite3/3-0.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/sqlite3/3-1.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/mysql2/4-0.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/postgresql/4-0.gemfile
-    - rvm: 2.0.0-p648
-      gemfile: gemfiles/sqlite3/4-0.gemfile
-    # Rails 4.1 was only compatible with ruby 2.1
-    - rvm: 2.1.9
-      gemfile: gemfiles/mysql2/4-1.gemfile
-    - rvm: 2.1.9
-      gemfile: gemfiles/postgresql/4-1.gemfile
-    - rvm: 2.1.9
-      gemfile: gemfiles/sqlite3/4-1.gemfile
-    # Rails 5.0 was EOL with the release of 5.2
-    - rvm: 2.4.4
-      gemfile: gemfiles/mysql2/5-0.gemfile
-    - rvm: 2.4.4
-      gemfile: gemfiles/postgresql/5-0.gemfile
-    - rvm: 2.4.4
-      gemfile: gemfiles/sqlite3/5-0.gemfile
-    #
-    # The parallel dimension
-    #
-    # Rubinius
-    - rvm: rbx-2
-      gemfile: gemfiles/mysql2/5-1.gemfile
-    - rvm: rbx-2
-      gemfile: gemfiles/postgresql/5-1.gemfile
-    - rvm: rbx-2
-      gemfile: gemfiles/sqlite3/5-1.gemfile
-
-sudo: false
diff --git a/Gemfile b/Gemfile
index 6a063649..270c0b85 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -15,11 +17,18 @@ group :test do
     gem "sqlite3"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 3"
+
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+end
+
+group :rubocop do
   gem "rubocop"
+  gem "rubocop-packaging"
+  gem "rubocop-performance"
+  gem "rubocop-rails"
   gem "rubocop-rspec"
-  gem "simplecov", require: false
 end
 
 gemspec
diff --git a/README.md b/README.md
index 7e87f786..49c821ec 100644
--- a/README.md
+++ b/README.md
@@ -1,14 +1,12 @@
 **If you're viewing this at https://github.com/collectiveidea/delayed_job_active_record,
 you're reading the documentation for the master branch.
 [View documentation for the latest release
-(4.1.3).](https://github.com/collectiveidea/delayed_job_active_record/tree/v4.1.3)**
+(4.1.7).](https://github.com/collectiveidea/delayed_job_active_record/tree/v4.1.7)**
 
 # DelayedJob ActiveRecord Backend
 
 [![Gem Version](https://img.shields.io/gem/v/delayed_job_active_record.svg)](https://rubygems.org/gems/delayed_job_active_record)
-[![Build Status](https://img.shields.io/travis/collectiveidea/delayed_job_active_record.svg)](https://travis-ci.org/collectiveidea/delayed_job_active_record)
-[![Dependency Status](https://img.shields.io/gemnasium/collectiveidea/delayed_job_active_record.svg)](https://gemnasium.com/collectiveidea/delayed_job_active_record)
-[![Code Climate](https://img.shields.io/codeclimate/github/collectiveidea/delayed_job_active_record.svg)](https://codeclimate.com/github/collectiveidea/delayed_job_active_record)
+![CI](https://github.com/collectiveidea/delayed_job_active_record/workflows/CI/badge.svg)
 [![Coverage Status](https://img.shields.io/coveralls/collectiveidea/delayed_job_active_record.svg)](https://coveralls.io/r/collectiveidea/delayed_job_active_record)
 
 ## Installation
diff --git a/Rakefile b/Rakefile
index b8d3c778..3ce82364 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "bundler/gem_helper"
 Bundler::GemHelper.install_tasks
 
diff --git a/delayed_job_active_record.gemspec b/delayed_job_active_record.gemspec
index f0c5f348..91f8a852 100644
--- a/delayed_job_active_record.gemspec
+++ b/delayed_job_active_record.gemspec
@@ -1,5 +1,7 @@
+# frozen_string_literal: true
+
 Gem::Specification.new do |spec|
-  spec.add_dependency "activerecord", [">= 3.0", "< 5.3"]
+  spec.add_dependency "activerecord", [">= 3.0", "< 8.0"]
   spec.add_dependency "delayed_job",  [">= 3.0", "< 5"]
   spec.authors        = ["Brian Ryckbost", "Matt Griffin", "Erik Michaels-Ober"]
   spec.description    = "ActiveRecord backend for Delayed::Job, originally authored by Tobias Lütke"
@@ -7,8 +9,9 @@ Gem::Specification.new do |spec|
   spec.files          = %w[CONTRIBUTING.md LICENSE.md README.md delayed_job_active_record.gemspec] + Dir["lib/**/*.rb"]
   spec.homepage       = "http://github.com/collectiveidea/delayed_job_active_record"
   spec.licenses       = ["MIT"]
+  spec.metadata       = { "rubygems_mfa_required" => "true" }
   spec.name           = "delayed_job_active_record"
   spec.require_paths  = ["lib"]
   spec.summary        = "ActiveRecord backend for DelayedJob"
-  spec.version        = "4.1.3"
+  spec.version        = "4.1.7"
 end
diff --git a/gemfiles/.rubocop.yml b/gemfiles/.rubocop.yml
new file mode 100644
index 00000000..d10863b5
--- /dev/null
+++ b/gemfiles/.rubocop.yml
@@ -0,0 +1,5 @@
+inherit_from:
+  - ../.rubocop.yml
+
+Naming/FileName:
+  Enabled: false
diff --git a/gemfiles/mysql2/3-0.gemfile b/gemfiles/mysql2/3-0.gemfile
index 836d9985..5c795a97 100644
--- a/gemfiles/mysql2/3-0.gemfile
+++ b/gemfiles/mysql2/3-0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -5,9 +7,9 @@ gem "rake"
 group :test do
   gem "activerecord-mysql2-adapter"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 3.0.0"
 end
diff --git a/gemfiles/mysql2/3-1.gemfile b/gemfiles/mysql2/3-1.gemfile
index 5eb7ed81..88ab34c8 100644
--- a/gemfiles/mysql2/3-1.gemfile
+++ b/gemfiles/mysql2/3-1.gemfile
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 gem "mysql2", "~> 0.3.10"
 
-gem "coveralls", require: false
 gem "rspec", ">= 2.11"
-gem "simplecov", require: false
+gem "simplecov", ">= 0.20.0", require: false
+gem "simplecov-lcov", ">= 0.8.0", require: false
 
 gem "activerecord", "~> 3.1.0"
 
diff --git a/gemfiles/mysql2/3-2.gemfile b/gemfiles/mysql2/3-2.gemfile
index 2fd7011f..7c5b0555 100644
--- a/gemfiles/mysql2/3-2.gemfile
+++ b/gemfiles/mysql2/3-2.gemfile
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 gem "mysql2", "~> 0.3.10"
 
-gem "coveralls", require: false
 gem "rspec", ">= 2.11"
-gem "simplecov", require: false
+gem "simplecov", ">= 0.17.0", require: false
+gem "simplecov-lcov", "< 0.8.0", require: false
 
 gem "activerecord", "~> 3.2.0"
 
diff --git a/gemfiles/mysql2/4-0.gemfile b/gemfiles/mysql2/4-0.gemfile
index a7720eb1..c6308680 100644
--- a/gemfiles/mysql2/4-0.gemfile
+++ b/gemfiles/mysql2/4-0.gemfile
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 gem "mysql2", "~> 0.3.10"
 
-gem "coveralls", require: false
 gem "rspec", ">= 2.11"
-gem "simplecov", require: false
+gem "simplecov", ">= 0.20.0", require: false
+gem "simplecov-lcov", ">= 0.8.0", require: false
 
 gem "activerecord", "~> 4.0.0"
 
diff --git a/gemfiles/mysql2/4-1.gemfile b/gemfiles/mysql2/4-1.gemfile
index 6f204a0e..7e08a6ef 100644
--- a/gemfiles/mysql2/4-1.gemfile
+++ b/gemfiles/mysql2/4-1.gemfile
@@ -1,12 +1,14 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 gem "mysql2", "~> 0.3.13"
 
-gem "coveralls", require: false
 gem "rspec", ">= 2.11"
-gem "simplecov", require: false
+gem "simplecov", ">= 0.17.0", require: false
+gem "simplecov-lcov", "< 0.8.0", require: false
 
 gem "activerecord", "~> 4.1.0"
 
diff --git a/gemfiles/mysql2/4-2.gemfile b/gemfiles/mysql2/4-2.gemfile
index 7e633d79..27225289 100644
--- a/gemfiles/mysql2/4-2.gemfile
+++ b/gemfiles/mysql2/4-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "mysql2", ">= 0.3.13", "< 0.5"
+    gem "mysql2", [">= 0.3.13", "< 0.5"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.18.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 4.2.0"
 end
diff --git a/gemfiles/mysql2/5-0.gemfile b/gemfiles/mysql2/5-0.gemfile
index 4c7d7d7d..46561217 100644
--- a/gemfiles/mysql2/5-0.gemfile
+++ b/gemfiles/mysql2/5-0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "mysql2"
+    gem "mysql2", [">= 0.3.18", "< 0.6.0"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.18.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.0.0"
 end
diff --git a/gemfiles/mysql2/5-1.gemfile b/gemfiles/mysql2/5-1.gemfile
index 249d3d2e..e4794542 100644
--- a/gemfiles/mysql2/5-1.gemfile
+++ b/gemfiles/mysql2/5-1.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "mysql2"
+    gem "mysql2", [">= 0.3.18", "< 0.6.0"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.1.0"
 end
diff --git a/gemfiles/mysql2/5-2.gemfile b/gemfiles/mysql2/5-2.gemfile
index ff77e119..e9e29970 100644
--- a/gemfiles/mysql2/5-2.gemfile
+++ b/gemfiles/mysql2/5-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "mysql2"
+    gem "mysql2", [">= 0.4.4", "< 0.6.0"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.2.0"
 end
diff --git a/gemfiles/mysql2/6-0.gemfile b/gemfiles/mysql2/6-0.gemfile
new file mode 100644
index 00000000..047b5b23
--- /dev/null
+++ b/gemfiles/mysql2/6-0.gemfile
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :jruby do
+    gem "activerecord-jdbcmysql-adapter"
+  end
+
+  platforms :ruby, :mswin, :mingw do
+    gem "mysql2", ">= 0.4.4"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 6.0.0"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/mysql2/6-1.gemfile b/gemfiles/mysql2/6-1.gemfile
new file mode 100644
index 00000000..a350c325
--- /dev/null
+++ b/gemfiles/mysql2/6-1.gemfile
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :jruby do
+    # Remove github when 61.0 releases
+    gem "activerecord-jdbcmysql-adapter", github: "jruby/activerecord-jdbc-adapter"
+  end
+
+  platforms :ruby, :mswin, :mingw do
+    gem "mysql2", "~> 0.5"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 6.1.0"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/mysql2/7-0.gemfile b/gemfiles/mysql2/7-0.gemfile
new file mode 100644
index 00000000..57bcae35
--- /dev/null
+++ b/gemfiles/mysql2/7-0.gemfile
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :ruby, :mswin, :mingw do
+    gem "mysql2", "~> 0.5"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 7.0.1"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/mysql2/master.gemfile b/gemfiles/mysql2/master.gemfile
index 65659451..2fa7be31 100644
--- a/gemfiles/mysql2/master.gemfile
+++ b/gemfiles/mysql2/master.gemfile
@@ -1,21 +1,25 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
   platforms :jruby do
-    gem "activerecord-jdbcmysql-adapter"
+    gem "activerecord-jdbcmysql-adapter", github: "jruby/activerecord-jdbc-adapter"
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "mysql2"
+    gem "mysql2", "~> 0.5"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", github: "rails"
 end
 
+gem "delayed_job", github: "collectiveidea/delayed_job"
+
 gemspec path: "../../"
diff --git a/gemfiles/postgresql/3-0.gemfile b/gemfiles/postgresql/3-0.gemfile
index b46ce039..f1f76235 100644
--- a/gemfiles/postgresql/3-0.gemfile
+++ b/gemfiles/postgresql/3-0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -5,9 +7,9 @@ gem "rake"
 group :test do
   gem "pg", "~> 0.18"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 3.0.0"
 end
diff --git a/gemfiles/postgresql/3-1.gemfile b/gemfiles/postgresql/3-1.gemfile
index 4fb54b95..541e9d85 100644
--- a/gemfiles/postgresql/3-1.gemfile
+++ b/gemfiles/postgresql/3-1.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -5,9 +7,9 @@ gem "rake"
 group :test do
   gem "pg", "~> 0.18"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 3.1.0"
 end
diff --git a/gemfiles/postgresql/3-2.gemfile b/gemfiles/postgresql/3-2.gemfile
index e6ce602e..54017ba8 100644
--- a/gemfiles/postgresql/3-2.gemfile
+++ b/gemfiles/postgresql/3-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -5,9 +7,9 @@ gem "rake"
 group :test do
   gem "pg", "~> 0.18"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.17.0", require: false
+  gem "simplecov-lcov", "< 0.8.0", require: false
 
   gem "activerecord", "~> 3.2.0"
 end
diff --git a/gemfiles/postgresql/4-0.gemfile b/gemfiles/postgresql/4-0.gemfile
index 31fba425..5f07d69f 100644
--- a/gemfiles/postgresql/4-0.gemfile
+++ b/gemfiles/postgresql/4-0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -5,9 +7,9 @@ gem "rake"
 group :test do
   gem "pg", "~> 0.18"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 4.0.0"
 end
diff --git a/gemfiles/postgresql/4-1.gemfile b/gemfiles/postgresql/4-1.gemfile
index 278501c1..ec6e40e3 100644
--- a/gemfiles/postgresql/4-1.gemfile
+++ b/gemfiles/postgresql/4-1.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -5,9 +7,9 @@ gem "rake"
 group :test do
   gem "pg", "~> 0.18"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.17.0", require: false
+  gem "simplecov-lcov", "< 0.8.0", require: false
 
   gem "activerecord", "~> 4.1.0"
 end
diff --git a/gemfiles/postgresql/4-2.gemfile b/gemfiles/postgresql/4-2.gemfile
index 047833e4..d9ce2220 100644
--- a/gemfiles/postgresql/4-2.gemfile
+++ b/gemfiles/postgresql/4-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "pg", "~> 0.18"
+    gem "pg", "~> 0.15"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.18.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 4.2.0"
 end
diff --git a/gemfiles/postgresql/5-0.gemfile b/gemfiles/postgresql/5-0.gemfile
index 3c71ef69..af510ae8 100644
--- a/gemfiles/postgresql/5-0.gemfile
+++ b/gemfiles/postgresql/5-0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "pg", "~> 0.18"
+    gem "pg", [">= 0.18", "< 2.0"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.18.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.0.0"
 end
diff --git a/gemfiles/postgresql/5-1.gemfile b/gemfiles/postgresql/5-1.gemfile
index 34e0c203..4aa022d7 100644
--- a/gemfiles/postgresql/5-1.gemfile
+++ b/gemfiles/postgresql/5-1.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "pg", "~> 0.18"
+    gem "pg", [">= 0.18", "< 2.0"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.1.0"
 end
diff --git a/gemfiles/postgresql/5-2.gemfile b/gemfiles/postgresql/5-2.gemfile
index e95902c7..758fd1bb 100644
--- a/gemfiles/postgresql/5-2.gemfile
+++ b/gemfiles/postgresql/5-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "pg", "~> 0.18"
+    gem "pg", [">= 0.18", "< 2.0"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.2.0"
 end
diff --git a/gemfiles/postgresql/6-0.gemfile b/gemfiles/postgresql/6-0.gemfile
new file mode 100644
index 00000000..d26dc504
--- /dev/null
+++ b/gemfiles/postgresql/6-0.gemfile
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :jruby do
+    gem "activerecord-jdbcpostgresql-adapter"
+  end
+
+  platforms :ruby, :mswin, :mingw do
+    gem "pg", [">= 0.18", "< 2.0"]
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 6.0.0"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/postgresql/6-1.gemfile b/gemfiles/postgresql/6-1.gemfile
new file mode 100644
index 00000000..19cb2b83
--- /dev/null
+++ b/gemfiles/postgresql/6-1.gemfile
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :jruby do
+    # Remove github when 61.0 releases
+    gem "activerecord-jdbcpostgresql-adapter", github: "jruby/activerecord-jdbc-adapter"
+  end
+
+  platforms :ruby, :mswin, :mingw do
+    gem "pg", "~> 1.1"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 6.1.0"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/postgresql/7-0.gemfile b/gemfiles/postgresql/7-0.gemfile
new file mode 100644
index 00000000..5e1a693d
--- /dev/null
+++ b/gemfiles/postgresql/7-0.gemfile
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :ruby, :mswin, :mingw do
+    gem "pg", "~> 1.1"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 7.0.1"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/postgresql/master.gemfile b/gemfiles/postgresql/master.gemfile
index 7ac422ba..8e6af335 100644
--- a/gemfiles/postgresql/master.gemfile
+++ b/gemfiles/postgresql/master.gemfile
@@ -1,21 +1,25 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
   platforms :jruby do
-    gem "activerecord-jdbcpostgresql-adapter"
+    gem "activerecord-jdbcpostgresql-adapter", github: "jruby/activerecord-jdbc-adapter"
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "pg", "~> 0.18"
+    gem "pg", "~> 1.1"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", github: "rails"
 end
 
+gem "delayed_job", github: "collectiveidea/delayed_job"
+
 gemspec path: "../../"
diff --git a/gemfiles/sqlite3/3-0.gemfile b/gemfiles/sqlite3/3-0.gemfile
index 71b10b4e..2788517b 100644
--- a/gemfiles/sqlite3/3-0.gemfile
+++ b/gemfiles/sqlite3/3-0.gemfile
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
-  gem "sqlite3"
+  gem "sqlite3", "< 1.4"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 3.0.0"
 end
diff --git a/gemfiles/sqlite3/3-1.gemfile b/gemfiles/sqlite3/3-1.gemfile
index 0099efad..1969fda0 100644
--- a/gemfiles/sqlite3/3-1.gemfile
+++ b/gemfiles/sqlite3/3-1.gemfile
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
-  gem "sqlite3"
+  gem "sqlite3", "< 1.4"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 3.1.0"
 end
diff --git a/gemfiles/sqlite3/3-2.gemfile b/gemfiles/sqlite3/3-2.gemfile
index bb3394ea..1521817c 100644
--- a/gemfiles/sqlite3/3-2.gemfile
+++ b/gemfiles/sqlite3/3-2.gemfile
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
-  gem "sqlite3"
+  gem "sqlite3", "< 1.4"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.17.0", require: false
+  gem "simplecov-lcov", "< 0.8.0", require: false
 
   gem "activerecord", "~> 3.2.0"
 end
diff --git a/gemfiles/sqlite3/4-0.gemfile b/gemfiles/sqlite3/4-0.gemfile
index ba3e3327..58f19ce5 100644
--- a/gemfiles/sqlite3/4-0.gemfile
+++ b/gemfiles/sqlite3/4-0.gemfile
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
-  gem "sqlite3"
+  gem "sqlite3", "< 1.4"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 4.0.0"
 end
diff --git a/gemfiles/sqlite3/4-1.gemfile b/gemfiles/sqlite3/4-1.gemfile
index 94a01013..0c3720f5 100644
--- a/gemfiles/sqlite3/4-1.gemfile
+++ b/gemfiles/sqlite3/4-1.gemfile
@@ -1,13 +1,15 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
-  gem "sqlite3"
+  gem "sqlite3", "< 1.4"
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.17.0", require: false
+  gem "simplecov-lcov", "< 0.8.0", require: false
 
   gem "activerecord", "~> 4.1.0"
 end
diff --git a/gemfiles/sqlite3/4-2.gemfile b/gemfiles/sqlite3/4-2.gemfile
index a2ae2f44..3dd24edc 100644
--- a/gemfiles/sqlite3/4-2.gemfile
+++ b/gemfiles/sqlite3/4-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "sqlite3"
+    gem "sqlite3", "~> 1.3.6"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.18.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 4.2.0"
 end
diff --git a/gemfiles/sqlite3/5-0.gemfile b/gemfiles/sqlite3/5-0.gemfile
index bc6e076c..e6534cb0 100644
--- a/gemfiles/sqlite3/5-0.gemfile
+++ b/gemfiles/sqlite3/5-0.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "sqlite3"
+    gem "sqlite3", "~> 1.3.6"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.18.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.0.0"
 end
diff --git a/gemfiles/sqlite3/5-1.gemfile b/gemfiles/sqlite3/5-1.gemfile
index 4c803830..e26dac0f 100644
--- a/gemfiles/sqlite3/5-1.gemfile
+++ b/gemfiles/sqlite3/5-1.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "sqlite3"
+    gem "sqlite3", ["~> 1.3", ">= 1.3.6"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.1.0"
 end
diff --git a/gemfiles/sqlite3/5-2.gemfile b/gemfiles/sqlite3/5-2.gemfile
index 6dc5a0a0..e504f4f5 100644
--- a/gemfiles/sqlite3/5-2.gemfile
+++ b/gemfiles/sqlite3/5-2.gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
@@ -8,12 +10,12 @@ group :test do
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "sqlite3"
+    gem "sqlite3", ["~> 1.3", ">= 1.3.6"]
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", "~> 5.2.0"
 end
diff --git a/gemfiles/sqlite3/6-0.gemfile b/gemfiles/sqlite3/6-0.gemfile
new file mode 100644
index 00000000..e69f1fb1
--- /dev/null
+++ b/gemfiles/sqlite3/6-0.gemfile
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :jruby do
+    gem "activerecord-jdbcsqlite3-adapter"
+  end
+
+  platforms :ruby, :mswin, :mingw do
+    gem "sqlite3", "~> 1.4"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 6.0.0"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/sqlite3/6-1.gemfile b/gemfiles/sqlite3/6-1.gemfile
new file mode 100644
index 00000000..cf00d980
--- /dev/null
+++ b/gemfiles/sqlite3/6-1.gemfile
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :jruby do
+    # Remove github when 61.0 releases
+    gem "activerecord-jdbcsqlite3-adapter", github: "jruby/activerecord-jdbc-adapter"
+  end
+
+  platforms :ruby, :mswin, :mingw do
+    gem "sqlite3", "~> 1.4"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 6.1.0"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/sqlite3/7-0.gemfile b/gemfiles/sqlite3/7-0.gemfile
new file mode 100644
index 00000000..b8950958
--- /dev/null
+++ b/gemfiles/sqlite3/7-0.gemfile
@@ -0,0 +1,19 @@
+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "rake"
+
+group :test do
+  platforms :ruby, :mswin, :mingw do
+    gem "sqlite3", "~> 1.4"
+  end
+
+  gem "rspec", ">= 2.11"
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
+
+  gem "activerecord", "~> 7.0.1"
+end
+
+gemspec path: "../../"
diff --git a/gemfiles/sqlite3/master.gemfile b/gemfiles/sqlite3/master.gemfile
index afd2bf9a..e2342249 100644
--- a/gemfiles/sqlite3/master.gemfile
+++ b/gemfiles/sqlite3/master.gemfile
@@ -1,21 +1,25 @@
+# frozen_string_literal: true
+
 source "https://rubygems.org"
 
 gem "rake"
 
 group :test do
   platforms :jruby do
-    gem "activerecord-jdbcsqlite3-adapter"
+    gem "activerecord-jdbcsqlite3-adapter", github: "jruby/activerecord-jdbc-adapter"
   end
 
   platforms :ruby, :mswin, :mingw do
-    gem "sqlite3"
+    gem "sqlite3", "~> 1.4"
   end
 
-  gem "coveralls", require: false
   gem "rspec", ">= 2.11"
-  gem "simplecov", require: false
+  gem "simplecov", ">= 0.20.0", require: false
+  gem "simplecov-lcov", ">= 0.8.0", require: false
 
   gem "activerecord", github: "rails"
 end
 
+gem "delayed_job", github: "collectiveidea/delayed_job"
+
 gemspec path: "../../"
diff --git a/lib/delayed/backend/active_record.rb b/lib/delayed/backend/active_record.rb
index b69fd050..1380ec8e 100644
--- a/lib/delayed/backend/active_record.rb
+++ b/lib/delayed/backend/active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_record/version"
 module Delayed
   module Backend
@@ -13,6 +15,7 @@ def reserve_sql_strategy=(val)
           if !(val == :optimized_sql || val == :default_sql)
             raise ArgumentError, "allowed values are :optimized_sql or :default_sql"
           end
+
           @reserve_sql_strategy = val
         end
       end
@@ -51,7 +54,7 @@ def self.set_delayed_job_table_name
 
         def self.ready_to_run(worker_name, max_run_time)
           where(
-            "(run_at <= ? AND (locked_at IS NULL OR locked_at < ?) OR locked_by = ?) AND failed_at IS NULL",
+            "((run_at <= ? AND (locked_at IS NULL OR locked_at < ?)) OR locked_by = ?) AND failed_at IS NULL",
             db_time_now,
             db_time_now - max_run_time,
             worker_name
@@ -109,8 +112,11 @@ def self.reserve_with_scope_using_optimized_sql(ready_scope, worker, now)
         end
 
         def self.reserve_with_scope_using_default_sql(ready_scope, worker, now)
-          # This is our old fashion, tried and true, but slower lookup
-          ready_scope.limit(worker.read_ahead).detect do |job|
+          # This is our old fashion, tried and true, but possibly slower lookup
+          # Instead of reading the entire job record for our detect loop, we select only the id,
+          # and only read the full job record after we've successfully locked the job.
+          # This can have a noticable impact on large read_ahead configurations and large payload jobs.
+          ready_scope.limit(worker.read_ahead).select(:id).detect do |job|
             count = ready_scope.where(id: job.id).update_all(locked_at: now, locked_by: worker.name)
             count == 1 && job.reload
           end
@@ -125,7 +131,7 @@ def self.reserve_with_scope_using_optimized_postgres(ready_scope, worker, now)
           # use 'FOR UPDATE' and we would have many locking conflicts
           quoted_name = connection.quote_table_name(table_name)
           subquery    = ready_scope.limit(1).lock(true).select("id").to_sql
-          sql         = "UPDATE #{quoted_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery}) RETURNING *"
+          sql         = "UPDATE #{quoted_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery} SKIP LOCKED) RETURNING *"
           reserved    = find_by_sql([sql, now, worker.name])
           reserved[0]
         end
@@ -141,6 +147,7 @@ def self.reserve_with_scope_using_optimized_mysql(ready_scope, worker, now)
           # UPDATE...LIMIT. It uses separate queries to lock and return the job
           count = ready_scope.limit(1).update_all(locked_at: now, locked_by: worker.name)
           return nil if count == 0
+
           where(locked_at: now, locked_by: worker.name, failed_at: nil).first
         end
 
@@ -154,6 +161,7 @@ def self.reserve_with_scope_using_optimized_mssql(ready_scope, worker, now)
           sql = "UPDATE #{quoted_table_name} SET locked_at = ?, locked_by = ? WHERE id IN (#{subquery_sql})"
           count = connection.execute(sanitize_sql([sql, now, worker.name]))
           return nil if count == 0
+
           # MSSQL JDBC doesn't support OUTPUT INSERTED.* for returning a result set, so query locked row
           where(locked_at: now, locked_by: worker.name, failed_at: nil).first
         end
diff --git a/lib/delayed_job_active_record.rb b/lib/delayed_job_active_record.rb
index e6efd295..a09638e6 100644
--- a/lib/delayed_job_active_record.rb
+++ b/lib/delayed_job_active_record.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "active_record"
 require "delayed_job"
 require "delayed/backend/active_record"
diff --git a/lib/generators/delayed_job/active_record_generator.rb b/lib/generators/delayed_job/active_record_generator.rb
index 3370f06b..b196a553 100644
--- a/lib/generators/delayed_job/active_record_generator.rb
+++ b/lib/generators/delayed_job/active_record_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "generators/delayed_job/delayed_job_generator"
 require "generators/delayed_job/next_migration_version"
 require "rails/generators/migration"
diff --git a/lib/generators/delayed_job/next_migration_version.rb b/lib/generators/delayed_job/next_migration_version.rb
index 64983128..0eb0b8de 100644
--- a/lib/generators/delayed_job/next_migration_version.rb
+++ b/lib/generators/delayed_job/next_migration_version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module DelayedJob
   module NextMigrationVersion
     # while methods have moved around this has been the implementation
diff --git a/lib/generators/delayed_job/templates/migration.rb b/lib/generators/delayed_job/templates/migration.rb
index bb90f0b0..6269ff0a 100644
--- a/lib/generators/delayed_job/templates/migration.rb
+++ b/lib/generators/delayed_job/templates/migration.rb
@@ -1,6 +1,6 @@
 class CreateDelayedJobs < ActiveRecord::Migration<%= migration_version %>
   def self.up
-    create_table :delayed_jobs, force: true do |table|
+    create_table :delayed_jobs do |table|
       table.integer :priority, default: 0, null: false # Allows some jobs to jump to the front of the queue
       table.integer :attempts, default: 0, null: false # Provides for retries, but still fail eventually.
       table.text :handler,                 null: false # YAML-encoded string of the object that will do work
diff --git a/lib/generators/delayed_job/upgrade_generator.rb b/lib/generators/delayed_job/upgrade_generator.rb
index 2383f5ac..90a19773 100644
--- a/lib/generators/delayed_job/upgrade_generator.rb
+++ b/lib/generators/delayed_job/upgrade_generator.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "generators/delayed_job/delayed_job_generator"
 require "generators/delayed_job/next_migration_version"
 require "rails/generators/migration"
diff --git a/spec/database.yml b/spec/database.yml
index 225b4bcf..0c41446c 100644
--- a/spec/database.yml
+++ b/spec/database.yml
@@ -1,19 +1,26 @@
 mysql:
   adapter: mysql
+  host: 127.0.0.1
   database: delayed_job_test
   username: root
+  port: 3306
   encoding: utf8
 
 mysql2:
   adapter: mysql2
+  host: 127.0.0.1
   database: delayed_job_test
   username: root
+  port: 3306
   encoding: utf8
 
 postgresql:
   adapter: postgresql
+  host: 127.0.0.1
   database: delayed_job_test
   username: postgres
+  password: postgres
+  port: 5432
 
 sqlite3:
   adapter: sqlite3
diff --git a/spec/delayed/backend/active_record_spec.rb b/spec/delayed/backend/active_record_spec.rb
index dd7bad96..16820420 100644
--- a/spec/delayed/backend/active_record_spec.rb
+++ b/spec/delayed/backend/active_record_spec.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require "helper"
 require "delayed/backend/active_record"
 
diff --git a/spec/delayed/serialization/active_record_spec.rb b/spec/delayed/serialization/active_record_spec.rb
index dbc4afae..f0b0cd30 100644
--- a/spec/delayed/serialization/active_record_spec.rb
+++ b/spec/delayed/serialization/active_record_spec.rb
@@ -1,15 +1,17 @@
+# frozen_string_literal: true
+
 require "helper"
 
 describe ActiveRecord do
   it "loads classes with non-default primary key" do
     expect do
-      YAML.load(Story.create.to_yaml)
+      YAML.load_dj(Story.create.to_yaml)
     end.not_to raise_error
   end
 
   it "loads classes even if not in default scope" do
     expect do
-      YAML.load(Story.create(scoped: false).to_yaml)
+      YAML.load_dj(Story.create(scoped: false).to_yaml)
     end.not_to raise_error
   end
 end
diff --git a/spec/helper.rb b/spec/helper.rb
index 80f3c280..8d5bf258 100644
--- a/spec/helper.rb
+++ b/spec/helper.rb
@@ -1,16 +1,21 @@
+# frozen_string_literal: true
+
 require "simplecov"
-require "coveralls"
+require "simplecov-lcov"
 
-SimpleCov.formatter = SimpleCov::Formatter::MultiFormatter.new(
+SimpleCov::Formatter::LcovFormatter.config do |c|
+  c.report_with_single_file = true
+  c.single_report_path = "coverage/lcov.info"
+end
+SimpleCov.formatters = SimpleCov::Formatter::MultiFormatter.new(
   [
     SimpleCov::Formatter::HTMLFormatter,
-    Coveralls::SimpleCov::Formatter
+    SimpleCov::Formatter::LcovFormatter
   ]
 )
 
 SimpleCov.start do
   add_filter "/spec/"
-  minimum_coverage(73.33)
 end
 
 require "logger"
@@ -18,7 +23,7 @@
 
 begin
   require "protected_attributes"
-rescue LoadError # rubocop:disable HandleExceptions
+rescue LoadError # rubocop:disable Lint/SuppressedException
 end
 require "delayed_job_active_record"
 require "delayed/backend/shared_spec"
@@ -28,7 +33,7 @@
 
 db_adapter = ENV["ADAPTER"]
 gemfile = ENV["BUNDLE_GEMFILE"]
-db_adapter ||= gemfile && gemfile[%r{gemfiles/(.*?)/}] && $1 # rubocop:disable PerlBackrefs
+db_adapter ||= gemfile && gemfile[%r{gemfiles/(.*?)/}] && $1 # rubocop:disable Style/PerlBackrefs
 db_adapter ||= "sqlite3"
 
 config = YAML.load(File.read("spec/database.yml"))
@@ -36,6 +41,20 @@
 ActiveRecord::Base.logger = Delayed::Worker.logger
 ActiveRecord::Migration.verbose = false
 
+# MySQL 5.7 no longer supports null default values for the primary key
+# Override the default primary key type in Rails <= 4.0
+# https://stackoverflow.com/a/34555109
+if db_adapter == "mysql2"
+  types = if defined?(ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter)
+    # ActiveRecord 3.2+
+    ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter::NATIVE_DATABASE_TYPES
+  else
+    # ActiveRecord < 3.2
+    ActiveRecord::ConnectionAdapters::Mysql2Adapter::NATIVE_DATABASE_TYPES
+  end
+  types[:primary_key] = types[:primary_key].sub(" DEFAULT NULL", "")
+end
+
 migration_template = File.open("lib/generators/delayed_job/templates/migration.rb")
 
 # need to eval the template with the migration_version intact
@@ -56,6 +75,11 @@ def migration_version
 eval(migration_ruby) # rubocop:disable Security/Eval
 
 ActiveRecord::Schema.define do
+  if table_exists?(:delayed_jobs)
+    # `if_exists: true` was only added in Rails 5
+    drop_table :delayed_jobs
+  end
+
   CreateDelayedJobs.up
 
   create_table :stories, primary_key: :story_id, force: true do |table|