diff --git a/.rubocop.yml b/.rubocop.yml
index 7b1dee2..e459f68 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -10,6 +10,8 @@ AllCops:
     - 'spec/dummy/**/*'
     - 'tmp/**/*'
     - 'bench/**/*'
+    - 'vendor/**/*'
+    - 'gemfiles/**/*'
     - 'lib/anycable/rpc/**/*'
     - 'Rakefile'
     - 'Gemfile'
@@ -27,6 +29,9 @@ Style/Documentation:
   Exclude:
     - 'spec/**/*.rb'
 
+Style/FormatString:
+  Enabled: false
+
 Style/StringLiterals: 
   Enabled: false
 
diff --git a/Rakefile b/Rakefile
index c92b11e..c749b00 100644
--- a/Rakefile
+++ b/Rakefile
@@ -1,6 +1,8 @@
 require "bundler/gem_tasks"
 require "rspec/core/rake_task"
+require "rubocop/rake_task"
 
 RSpec::Core::RakeTask.new(:spec)
+RuboCop::RakeTask.new
 
-task default: :spec
+task default: [:rubocop, :spec]
diff --git a/anycable-rails.gemspec b/anycable-rails.gemspec
index e24cfad..bdb6e7c 100644
--- a/anycable-rails.gemspec
+++ b/anycable-rails.gemspec
@@ -25,5 +25,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", ">= 3.4"
   spec.add_development_dependency "simplecov", ">= 0.3.8"
+  spec.add_development_dependency "rubocop", ">= 0.50"
   spec.add_development_dependency "pry-byebug"
 end
diff --git a/lib/anycable/rails/actioncable/connection.rb b/lib/anycable/rails/actioncable/connection.rb
index 0a7a46e..5def42e 100644
--- a/lib/anycable/rails/actioncable/connection.rb
+++ b/lib/anycable/rails/actioncable/connection.rb
@@ -1,4 +1,5 @@
 # frozen_string_literal: true
+
 require "action_cable/connection"
 require "anycable/rails/refinements/subscriptions"
 require "anycable/rails/actioncable/channel"