diff --git a/.rubocop.yml b/.rubocop.yml
index b3c997c..5484145 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -2,31 +2,3 @@
 AllCops:
   Exclude:
   - vendor/**/*
-Documentation:
-  Enabled: false
-Layout/ParameterAlignment:
-  Enabled: true
-HashSyntax:
-  Enabled: true
-LineLength:
-  Enabled: false
-EmptyLinesAroundBlockBody:
-  Enabled: false
-Style/Encoding:
-  Enabled: false
-MethodLength:
-  Max: 40
-NumericLiterals:
-  MinDigits: 10
-Metrics/BlockLength:
-  Max: 35
-Metrics/CyclomaticComplexity:
-  Max: 10
-Metrics/PerceivedComplexity:
-  Max: 10
-Metrics/AbcSize:
-  Max: 30
-# Lint/AmbiguousBlockAssociation is incompatible with RSpec
-# https://github.com/rubocop-hq/rubocop/issues/4222
-Lint/AmbiguousBlockAssociation:
-  Enabled: false
diff --git a/Gemfile b/Gemfile
index a076fc4..3a0b06c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,6 +2,7 @@
 
 source 'https://rubygems.org'
 
+gem 'cookstyle'
 gem 'highline'
 gem 'rack'
 gem 'rake'
diff --git a/Rakefile b/Rakefile
index 045b0fd..82f16c3 100755
--- a/Rakefile
+++ b/Rakefile
@@ -1,7 +1,7 @@
 #!/usr/bin/env rake
-# encoding: utf-8
 # frozen_string_literal: true
 
+require 'cookstyle'
 require 'rake/testtask'
 require 'rubocop/rake_task'
 
@@ -11,6 +11,10 @@ task :rubocop do
   RuboCop::RakeTask.new
 end
 
+RuboCop::RakeTask.new(:cookstyle) do |task|
+  task.options << '--display-cop-names'
+end
+
 # lint the project
 desc 'Run robocop linter'
 task lint: [:rubocop]
@@ -46,5 +50,4 @@ task :changelog do
   Rake::Task[:changelog].execute
 rescue LoadError
   puts '>>>>> GitHub Changelog Generator not loaded, omitting tasks'
-
 end
diff --git a/controls/patches.rb b/controls/patches.rb
index 509b0ce..509ccbf 100644
--- a/controls/patches.rb
+++ b/controls/patches.rb
@@ -1,4 +1,3 @@
-# encoding: utf-8
 # frozen_string_literal: true
 
 # copyright: 2016, Christoph Hartmann
diff --git a/libraries/linux_updates.rb b/libraries/linux_updates.rb
index d173fd5..33ac5bf 100644
--- a/libraries/linux_updates.rb
+++ b/libraries/linux_updates.rb
@@ -1,4 +1,3 @@
-# encoding: utf-8
 # frozen_string_literal: true
 
 # copyright: 2016, Christoph Hartmann
@@ -49,7 +48,7 @@ def updates
   end
 
   def uptodate?
-    return nil if @update_mgmt.nil?
+    return if @update_mgmt.nil?
 
     u = @update_mgmt.updates
     return false if u.nil? || !u['available'].empty?
@@ -198,7 +197,6 @@ def debian_base
 
 class RHELUpdateFetcher < UpdateFetcher
   def packages
-    # rubocop:disable Style/FormatStringToken
     rhel_packages = <<~PRINT_JSON
       sleep 2 && echo " "
       echo -n '{"installed":['
@@ -207,7 +205,6 @@ def packages
       echo -n ']}'
     PRINT_JSON
     parse_json(rhel_packages)
-    # rubocop:enable Style/FormatStringToken
   end
 
   def updates
@@ -219,7 +216,7 @@ def updates
     unless cmd.exit_status.zero?
       # essentially we want https://github.com/chef/inspec/issues/1205
       warn 'Could not determine patch status.'
-      return nil
+      return
     end
 
     first = cmd.stdout.index('{')