diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2afb61a..bc50187 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,93 +1,34 @@
-name: CI
-on: [push, pull_request]
-env:
-  RAILS_ENV: test
-  DATABASE_URL: postgresql://postgres:@localhost/test
-  DATABASE_CLEANER_ALLOW_REMOTE_DATABASE_URL: true
+name: Ruby test
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+concurrency:
+  group: ${{ github.ref_name }}-${{ github.workflow }}
+  cancel-in-progress: true
+
 jobs:
   rubocop:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: 2.4
-      - name: Setup
-        run: |
-          gem install bundler
-          bundle install --jobs=3 --retry=3
-      - name: Run rubocop
-        run: bundle exec rubocop
+    uses: theforeman/actions/.github/workflows/rubocop.yml@v0
+    with:
+      command: bundle exec rubocop --parallel --format github
+
   test:
-    runs-on: ubuntu-latest
+    name: Ruby
     needs: rubocop
-    services:
-      postgres:
-        image: postgres:12.1
-        ports: ['5432:5432']
-        options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5
     strategy:
       fail-fast: false
       matrix:
-        foreman-core-branch: [1.21-stable, 1.22-stable, 1.23-stable, 1.24-stable, 2.0-stable, 2.1-stable, 2.2-stable, develop]
-        ruby-version: [2.4, 2.5, 2.6]
-        node-version: [10]
-        exclude:
-          - foreman-core-branch: 2.0-stable
-            ruby-version: 2.4
-          - foreman-core-branch: 2.1-stable
-            ruby-version: 2.4
-          - foreman-core-branch: 2.2-stable
-            ruby-version: 2.4
-          - foreman-core-branch: develop
-            ruby-version: 2.4
-    steps:
-      - name: Install dependencies
-        run: |
-          sudo apt-get update
-          sudo apt-get install build-essential libcurl4-openssl-dev libvirt-dev ruby-libvirt zlib1g-dev libpq-dev
-      - uses: actions/checkout@v2
-        with:
-          repository: theforeman/foreman
-          ref: ${{ matrix.foreman-core-branch }}
-      - uses: actions/checkout@v2
-        with:
-          path: foreman_rescue
-      - name: Setup Ruby
-        uses: ruby/setup-ruby@v1
-        with:
-          ruby-version: ${{ matrix.ruby-version }}
-      - name: Setup Node
-        uses: actions/setup-node@v1
-        with:
-          node-version:  ${{ matrix.node-version }}
-      - name: Setup Bundler
-        run: |
-          echo "gem 'foreman_rescue', path: './foreman_rescue'" > bundler.d/foreman_rescue.local.rb
-          gem install bundler
-          bundle config path vendor/bundle
-          bundle config set without journald development console mysql2 sqlite
-          bundle lock --update
-      - name: Cache gems
-        uses: actions/cache@v2
-        with:
-          path: vendor/bundle
-          key: ${{ runner.os }}-gems-${{ hashFiles('**/Gemfile.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-gems-
-      - name: Setup Plugin
-        run: |
-          bundle install --jobs=3 --retry=3
-          bundle exec rake db:create
-          bundle exec rake db:migrate
-          npm install
-          bundle exec rake webpack:compile
-      - name: Run plugin tests
-        run: |
-          bundle exec rake test:foreman_rescue
-          bundle exec rake test TEST="test/unit/foreman/access_permissions_test.rb"
-      - name: Precompile plugin assets
-        run: bundle exec rake 'plugin:assets:precompile[foreman_rescue]'
-        env:
-          RAILS_ENV: production
+        foreman:
+          - "develop"
+          - "3.10-stable"
+          - "3.9-stable"
+    uses: theforeman/actions/.github/workflows/foreman_plugin.yml@v0
+    with:
+      plugin: foreman_rescue
+      foreman_version: ${{ matrix.foreman }}
+      environment_variables: |
+        FOREMAN_VERSION=${{ matrix.foreman }}
diff --git a/.rubocop.yml b/.rubocop.yml
index f5ebb93..265af1a 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -1,15 +1,10 @@
-AllCops:
-   TargetRubyVersion: 2.2
-   TargetRailsVersion: 5.1
-   Exclude:
-     - '*.spec'
-     - 'Rakefile'
+inherit_gem:
+  theforeman-rubocop:
+    - default.yml
 
-Rails:
-  Enabled: true
-
-Rails/ActionFilter:
-  EnforcedStyle: action
+Style/FrozenStringLiteralComment:
+  Exclude:
+    - Rakefile
 
 # Don't enforce documentation
 Style/Documentation:
@@ -22,10 +17,6 @@ Metrics/ClassLength:
   Exclude:
     - 'test/**/*'
 
-Performance/FixedSize:
-  Exclude:
-    - 'test/**/*'
-
 Metrics/BlockLength:
   Exclude:
     - 'test/**/*'
@@ -47,7 +38,7 @@ Style/HashSyntax:
     - ruby19
     - hash_rockets
 
-Metrics/LineLength:
+Layout/LineLength:
   Max: 190
 
 Style/SymbolArray:
diff --git a/Gemfile b/Gemfile
index fa75df1..7f4f5e9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 source 'https://rubygems.org'
 
 gemspec
diff --git a/Rakefile b/Rakefile
index aaf755b..0ed8e76 100755
--- a/Rakefile
+++ b/Rakefile
@@ -20,7 +20,7 @@ RDoc::Task.new(:rdoc) do |rdoc|
   rdoc.rdoc_files.include('lib/**/*.rb')
 end
 
-APP_RAKEFILE = File.expand_path('../test/dummy/Rakefile', __FILE__)
+APP_RAKEFILE = File.expand_path('test/dummy/Rakefile', __dir__)
 
 Bundler::GemHelper.install_tasks
 
@@ -38,7 +38,7 @@ task default: :test
 begin
   require 'rubocop/rake_task'
   RuboCop::RakeTask.new
-rescue => _
+rescue StandardError => _e
   puts 'Rubocop not loaded.'
 end
 
diff --git a/app/controllers/foreman_rescue/hosts_controller.rb b/app/controllers/foreman_rescue/hosts_controller.rb
index 72edf33..f61408d 100644
--- a/app/controllers/foreman_rescue/hosts_controller.rb
+++ b/app/controllers/foreman_rescue/hosts_controller.rb
@@ -1,9 +1,12 @@
+# frozen_string_literal: true
+
 module ForemanRescue
   class HostsController < ::HostsController
     before_action :find_resource, :only => [:rescue, :set_rescue, :cancel_rescue]
     define_action_permission ['rescue', 'set_rescue', 'cancel_rescue'], :rescue
 
-    def rescue; end
+    def rescue
+    end
 
     def set_rescue
       forward_url_options
@@ -16,10 +19,10 @@ def set_rescue
                         _('Enabled %s for boot into rescue system on next boot, but failed to power cycle the host.')
                       end
             process_success :success_msg => message % @host, :success_redirect => :back
-          rescue StandardError => error
+          rescue StandardError => e
             message = _('Failed to reboot %s.') % @host
             warning(message)
-            Foreman::Logging.exception(message, error)
+            Foreman::Logging.exception(message, e)
             process_success :success_msg => _('Enabled %s for rescue system on next boot.') % @host, :success_redirect => :back
           end
         else
@@ -35,8 +38,10 @@ def cancel_rescue
         process_success :success_msg => _('Canceled booting into rescue system for %s.') % @host.name, :success_redirect => :back
       else
         process_error :redirect => :back,
-                      :error_msg => _('Failed to cancel booting into rescue system for %{hostname} with the following errors: %{errors}') %
-                                    { :hostname => @host.name, :errors => @host.errors.full_messages.to_sentence }
+          :error_msg => _('Failed to cancel booting into rescue system for %{hostname} with the following errors: %{errors}') % {
+            :hostname => @host.name,
+            :errors => @host.errors.full_messages.to_sentence,
+          }
       end
     end
   end
diff --git a/app/helpers/concerns/foreman_rescue/hosts_helper_extensions.rb b/app/helpers/concerns/foreman_rescue/hosts_helper_extensions.rb
index 2eb2292..22383e1 100644
--- a/app/helpers/concerns/foreman_rescue/hosts_helper_extensions.rb
+++ b/app/helpers/concerns/foreman_rescue/hosts_helper_extensions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ForemanRescue
   module HostsHelperExtensions
     def host_title_actions(host)
@@ -5,15 +7,15 @@ def host_title_actions(host)
         button_group(
           if host.rescue_mode?
             link_to_if_authorized(_('Cancel rescue'), hash_for_cancel_rescue_host_path(:id => host).merge(:auth_object => host, :permission => 'rescue_hosts'),
-                                  :disabled => host.can_be_rescued?,
-                                  :title    => _('Cancel rescue system for this host.'),
-                                  :class => 'btn btn-default',
-                                  :method => :put)
+              :disabled => host.can_be_rescued?,
+              :title => _('Cancel rescue system for this host.'),
+              :class => 'btn btn-default',
+              :method => :put)
           else
             link_to_if_authorized(_('Rescue'), hash_for_rescue_host_path(:id => host).merge(:auth_object => host, :permission => 'rescue_hosts'),
-                                  :disabled => !host.can_be_rescued?,
-                                  :title    => _('Activate rescue mode for this host.'),
-                                  :class    => 'btn btn-default')
+              :disabled => !host.can_be_rescued?,
+              :title => _('Activate rescue mode for this host.'),
+              :class => 'btn btn-default')
           end
         )
       )
diff --git a/app/models/concerns/foreman_rescue/host_extensions.rb b/app/models/concerns/foreman_rescue/host_extensions.rb
index 0351789..d52dc46 100644
--- a/app/models/concerns/foreman_rescue/host_extensions.rb
+++ b/app/models/concerns/foreman_rescue/host_extensions.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ForemanRescue
   module HostExtensions
     def self.prepended(base)
diff --git a/app/models/concerns/foreman_rescue/orchestration/tftp.rb b/app/models/concerns/foreman_rescue/orchestration/tftp.rb
index e55f55f..b58484b 100644
--- a/app/models/concerns/foreman_rescue/orchestration/tftp.rb
+++ b/app/models/concerns/foreman_rescue/orchestration/tftp.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ForemanRescue
   module Orchestration
     module TFTP
diff --git a/app/models/setting/rescue.rb b/app/models/setting/rescue.rb
index 602c956..6df1031 100644
--- a/app/models/setting/rescue.rb
+++ b/app/models/setting/rescue.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Setting
   class Rescue < ::Setting
     BLANK_ATTRS.concat ['rescue_pxegrub_tftp_template', 'rescue_pxegrub2_tftp_template']
@@ -5,17 +7,17 @@ class Rescue < ::Setting
     def self.default_settings
       [
         set('rescue_pxelinux_tftp_template',
-            N_('PXELinux template used when booting rescue system'),
-            'Kickstart rescue PXELinux', N_('PXELinux rescue template'), nil,
-            :collection => proc { Setting::Rescue.templates('PXELinux') }),
+          N_('PXELinux template used when booting rescue system'),
+          'Kickstart rescue PXELinux', N_('PXELinux rescue template'), nil,
+          :collection => proc { Setting::Rescue.templates('PXELinux') }),
         set('rescue_pxegrub_tftp_template',
-            N_('PXEGrub template used when booting rescue system'),
-            '', N_('PXEGrub rescue template'), nil,
-            :collection => proc { Setting::Rescue.templates('PXEGrub') }),
+          N_('PXEGrub template used when booting rescue system'),
+          '', N_('PXEGrub rescue template'), nil,
+          :collection => proc { Setting::Rescue.templates('PXEGrub') }),
         set('rescue_pxegrub2_tftp_template',
-            N_('PXEGrub2 template used when booting rescue system'),
-            '', N_('PXEGrub2 rescue template'), nil,
-            :collection => proc { Setting::Rescue.templates('PXEGrub2') })
+          N_('PXEGrub2 template used when booting rescue system'),
+          '', N_('PXEGrub2 rescue template'), nil,
+          :collection => proc { Setting::Rescue.templates('PXEGrub2') }),
       ]
     end
 
diff --git a/config/routes.rb b/config/routes.rb
index 87cf83a..6d0ea40 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 Rails.application.routes.draw do
   constraints(:id => /[^\/]+/) do
     resources :hosts, controller: 'foreman_rescue/hosts', :only => [] do
diff --git a/db/migrate/20170901131321_add_rescue_mode_to_host.foreman_rescue.rb b/db/migrate/20170901131321_add_rescue_mode_to_host.foreman_rescue.rb
index fc9e2ce..931e079 100644
--- a/db/migrate/20170901131321_add_rescue_mode_to_host.foreman_rescue.rb
+++ b/db/migrate/20170901131321_add_rescue_mode_to_host.foreman_rescue.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class AddRescueModeToHost < ActiveRecord::Migration[4.2]
   def change
     add_column :hosts, :rescue_mode, :boolean, default: false, index: true
diff --git a/db/seeds.d/103-provisioning_templates.rb b/db/seeds.d/103-provisioning_templates.rb
index ecf81ff..90446a8 100644
--- a/db/seeds.d/103-provisioning_templates.rb
+++ b/db/seeds.d/103-provisioning_templates.rb
@@ -1,6 +1,8 @@
+# frozen_string_literal: true
+
 User.as_anonymous_admin do
   templates = [
-    { :name => 'Kickstart rescue PXELinux', :source => 'PXELinux/kickstart_rescue_pxelinux.erb', :template_kind => TemplateKind.find_by(:name => 'PXELinux') }
+    { :name => 'Kickstart rescue PXELinux', :source => 'PXELinux/kickstart_rescue_pxelinux.erb', :template_kind => TemplateKind.find_by(:name => 'PXELinux') },
   ]
 
   templates.each do |template|
diff --git a/foreman_rescue.gemspec b/foreman_rescue.gemspec
index c6d15b6..6cc28ab 100644
--- a/foreman_rescue.gemspec
+++ b/foreman_rescue.gemspec
@@ -1,4 +1,6 @@
-require File.expand_path('../lib/foreman_rescue/version', __FILE__)
+# frozen_string_literal: true
+
+require File.expand_path('lib/foreman_rescue/version', __dir__)
 
 Gem::Specification.new do |s|
   s.name        = 'foreman_rescue'
@@ -11,9 +13,11 @@ Gem::Specification.new do |s|
   # also update locale/gemspec.rb
   s.description = 'Foreman Plugin to provide the ability to boot a host into a rescue system.'
 
+  s.required_ruby_version = '>= 2.5', '< 4'
+
   s.files = Dir['{app,config,db,lib,locale}/**/*'] + ['LICENSE', 'Rakefile', 'README.md']
   s.test_files = Dir['test/**/*']
 
   s.add_development_dependency 'rdoc'
-  s.add_development_dependency 'rubocop', '0.52.0'
+  s.add_development_dependency 'theforeman-rubocop', '~> 0.1.2'
 end
diff --git a/lib/foreman_rescue.rb b/lib/foreman_rescue.rb
index f4f47b8..ca6aa23 100644
--- a/lib/foreman_rescue.rb
+++ b/lib/foreman_rescue.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'foreman_rescue/engine'
 
 module ForemanRescue
diff --git a/lib/foreman_rescue/engine.rb b/lib/foreman_rescue/engine.rb
index 096714b..3523df6 100644
--- a/lib/foreman_rescue/engine.rb
+++ b/lib/foreman_rescue/engine.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ForemanRescue
   class Engine < ::Rails::Engine
     engine_name 'foreman_rescue'
@@ -13,19 +15,19 @@ class Engine < ::Rails::Engine
     end
 
     initializer 'foreman_monitoring.load_default_settings',
-                :before => :load_config_initializers do |_app|
+      :before => :load_config_initializers do |_app|
       if begin
         Setting.table_exists?
       rescue StandardError
         false
       end
-        require_dependency File.expand_path('../../../app/models/setting/rescue.rb', __FILE__)
+        require_dependency File.expand_path('../../app/models/setting/rescue.rb', __dir__)
       end
     end
 
     initializer 'foreman_rescue.register_plugin', :before => :finisher_hook do |_app|
       Foreman::Plugin.register :foreman_rescue do
-        requires_foreman '>= 1.21'
+        requires_foreman '>= 3.9'
 
         # Add permissions
         security_block :foreman_rescue do
@@ -35,13 +37,11 @@ class Engine < ::Rails::Engine
     end
 
     config.to_prepare do
-      begin
-        Host::Managed.send(:prepend, ForemanRescue::HostExtensions)
-        HostsHelper.send(:prepend, ForemanRescue::HostsHelperExtensions)
-        Nic::Managed.send(:prepend, ForemanRescue::Orchestration::TFTP)
-      rescue StandardError => e
-        Rails.logger.warn "ForemanRescue: skipping engine hook (#{e})"
-      end
+      Host::Managed.prepend ForemanRescue::HostExtensions
+      HostsHelper.prepend ForemanRescue::HostsHelperExtensions
+      Nic::Managed.prepend ForemanRescue::Orchestration::TFTP
+    rescue StandardError => e
+      Rails.logger.warn "ForemanRescue: skipping engine hook (#{e})"
     end
 
     rake_tasks do
@@ -51,7 +51,7 @@ class Engine < ::Rails::Engine
     end
 
     initializer 'foreman_rescue.register_gettext', after: :load_config_initializers do |_app|
-      locale_dir = File.join(File.expand_path('../../..', __FILE__), 'locale')
+      locale_dir = File.join(File.expand_path('../..', __dir__), 'locale')
       locale_domain = 'foreman_rescue'
       Foreman::Gettext::Support.add_text_domain locale_domain, locale_dir
     end
diff --git a/lib/foreman_rescue/version.rb b/lib/foreman_rescue/version.rb
index f657fe7..779885b 100644
--- a/lib/foreman_rescue/version.rb
+++ b/lib/foreman_rescue/version.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 module ForemanRescue
-  VERSION = '3.0.0'.freeze
+  VERSION = '3.0.0'
 end
diff --git a/lib/tasks/foreman_rescue_tasks.rake b/lib/tasks/foreman_rescue_tasks.rake
index 4635bdd..38d4f8a 100644
--- a/lib/tasks/foreman_rescue_tasks.rake
+++ b/lib/tasks/foreman_rescue_tasks.rake
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'rake/testtask'
 
 # Tests
@@ -13,7 +15,7 @@ namespace :test do
 end
 
 namespace :foreman_rescue do
-  task :rubocop do
+  task rubocop: :environment do
     begin
       require 'rubocop/rake_task'
       RuboCop::RakeTask.new(:rubocop_foreman_rescue) do |task|
diff --git a/locale/gemspec.rb b/locale/gemspec.rb
index 14cbc6a..111f485 100644
--- a/locale/gemspec.rb
+++ b/locale/gemspec.rb
@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 # Matches foreman_rescue.gemspec
 _('TODO: Description of ForemanRescue.')
diff --git a/test/controllers/hosts_controller_test.rb b/test/controllers/hosts_controller_test.rb
index 73b956a..f20fa8e 100644
--- a/test/controllers/hosts_controller_test.rb
+++ b/test/controllers/hosts_controller_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_plugin_helper'
 
 module ForemanRescue
diff --git a/test/factories/host.rb b/test/factories/host.rb
index 992830f..36af20e 100644
--- a/test/factories/host.rb
+++ b/test/factories/host.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 FactoryBot.modify do
   factory :host do
     trait :rescue_mode do
diff --git a/test/lib/tasks/seeds_test.rb b/test/lib/tasks/seeds_test.rb
index 3eac976..9ac3c77 100644
--- a/test/lib/tasks/seeds_test.rb
+++ b/test/lib/tasks/seeds_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_plugin_helper'
 
 module ForemanRescue
@@ -27,7 +29,7 @@ class SeedsTest < ActiveSupport::TestCase
     def seed
       User.current = FactoryBot.build(:user, :admin => true,
                                              :organizations => [], :locations => [])
-      load Rails.root.join('db', 'seeds.rb')
+      load Rails.root.join('db/seeds.rb')
     end
   end
 end
diff --git a/test/models/host_test.rb b/test/models/host_test.rb
index a457364..816cc97 100644
--- a/test/models/host_test.rb
+++ b/test/models/host_test.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_plugin_helper'
 
 class HostTest < ActiveSupport::TestCase
diff --git a/test/test_plugin_helper.rb b/test/test_plugin_helper.rb
index ddf429b..3c113aa 100644
--- a/test/test_plugin_helper.rb
+++ b/test/test_plugin_helper.rb
@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 # This calls the main test_helper in Foreman-core
 require 'test_helper'
 require 'database_cleaner'