diff --git a/.travis.yml b/.travis.yml
index 5b0c603..662952b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -43,6 +43,11 @@ jobs:
     # TODO: Remove when 6.0 stable will ship rails/rails#39697
     - rvm: 3.0.1
       gemfile: gemfiles/rails_6.0.gemfile
+  include:
+    - rvm: 2.4.10
+      gemfile: Gemfile
+      script: bundle exec rake rubocop
+      name: RuboCop
   exclude:
     - rvm: 2.4.10
       gemfile: gemfiles/rails_6.1.gemfile
@@ -74,4 +79,4 @@ jobs:
       gemfile: gemfiles/rails_5.2.gemfile
   fast_finish: true
 
-script: bundle exec rake test:all
+script: bundle exec rake test:ruby test:js
diff --git a/Gemfile b/Gemfile
index aa3d23e..3ebf22d 100644
--- a/Gemfile
+++ b/Gemfile
@@ -4,3 +4,9 @@ source 'https://rubygems.org'
 
 # Specify your gem's dependencies in client_side_validations.gemspec
 gemspec
+
+gem 'rubocop', '~> 1.12.1'
+gem 'rubocop-minitest', '~> 0.11.1'
+gem 'rubocop-performance', '~> 1.10.2'
+gem 'rubocop-rails', '~> 2.9'
+gem 'rubocop-rake', '~> 0.5.1'
diff --git a/client_side_validations.gemspec b/client_side_validations.gemspec
index 298ffd1..91b3049 100644
--- a/client_side_validations.gemspec
+++ b/client_side_validations.gemspec
@@ -36,11 +36,6 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'minitest', '~> 5.14'
   spec.add_development_dependency 'mocha', '~> 1.12'
   spec.add_development_dependency 'rake', '~> 13.0'
-  spec.add_development_dependency 'rubocop', '~> 1.12'
-  spec.add_development_dependency 'rubocop-minitest', '~> 0.11.0'
-  spec.add_development_dependency 'rubocop-performance', '~> 1.10'
-  spec.add_development_dependency 'rubocop-rails', '~> 2.9'
-  spec.add_development_dependency 'rubocop-rake', '~> 0.5.1'
   spec.add_development_dependency 'simplecov', '>= 0.18.5', '< 0.22'
   spec.add_development_dependency 'sqlite3', '~> 1.4'
 
diff --git a/gemfiles/rails_5.0.gemfile b/gemfiles/rails_5.0.gemfile
index 9a09015..ea56652 100644
--- a/gemfiles/rails_5.0.gemfile
+++ b/gemfiles/rails_5.0.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rubocop", "~> 1.12.1"
+gem "rubocop-minitest", "~> 0.11.1"
+gem "rubocop-performance", "~> 1.10.2"
+gem "rubocop-rails", "~> 2.9"
+gem "rubocop-rake", "~> 0.5.1"
 gem "rails", "~> 5.0.0"
 gem "sqlite3", "~> 1.3.6"
 
diff --git a/gemfiles/rails_5.1.gemfile b/gemfiles/rails_5.1.gemfile
index 1edc9a1..40a38f3 100644
--- a/gemfiles/rails_5.1.gemfile
+++ b/gemfiles/rails_5.1.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rubocop", "~> 1.12.1"
+gem "rubocop-minitest", "~> 0.11.1"
+gem "rubocop-performance", "~> 1.10.2"
+gem "rubocop-rails", "~> 2.9"
+gem "rubocop-rake", "~> 0.5.1"
 gem "rails", "~> 5.1.0"
 gem "sqlite3", "~> 1.3.6"
 
diff --git a/gemfiles/rails_5.2.gemfile b/gemfiles/rails_5.2.gemfile
index 5a706dc..de8caed 100644
--- a/gemfiles/rails_5.2.gemfile
+++ b/gemfiles/rails_5.2.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rubocop", "~> 1.12.1"
+gem "rubocop-minitest", "~> 0.11.1"
+gem "rubocop-performance", "~> 1.10.2"
+gem "rubocop-rails", "~> 2.9"
+gem "rubocop-rake", "~> 0.5.1"
 gem "rails", "~> 5.2.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_6.0.gemfile b/gemfiles/rails_6.0.gemfile
index 15b9b27..50ac511 100644
--- a/gemfiles/rails_6.0.gemfile
+++ b/gemfiles/rails_6.0.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rubocop", "~> 1.12.1"
+gem "rubocop-minitest", "~> 0.11.1"
+gem "rubocop-performance", "~> 1.10.2"
+gem "rubocop-rails", "~> 2.9"
+gem "rubocop-rake", "~> 0.5.1"
 gem "rails", "~> 6.0.0"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_6.1.gemfile b/gemfiles/rails_6.1.gemfile
index 7e95520..8b638dd 100644
--- a/gemfiles/rails_6.1.gemfile
+++ b/gemfiles/rails_6.1.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rubocop", "~> 1.12.1"
+gem "rubocop-minitest", "~> 0.11.1"
+gem "rubocop-performance", "~> 1.10.2"
+gem "rubocop-rails", "~> 2.9"
+gem "rubocop-rake", "~> 0.5.1"
 gem "rails", "~> 6.1.0.rc1"
 
 gemspec path: "../"
diff --git a/gemfiles/rails_edge.gemfile b/gemfiles/rails_edge.gemfile
index 5d00b31..bdfe555 100644
--- a/gemfiles/rails_edge.gemfile
+++ b/gemfiles/rails_edge.gemfile
@@ -2,6 +2,11 @@
 
 source "https://rubygems.org"
 
+gem "rubocop", "~> 1.12.1"
+gem "rubocop-minitest", "~> 0.11.1"
+gem "rubocop-performance", "~> 1.10.2"
+gem "rubocop-rails", "~> 2.9"
+gem "rubocop-rake", "~> 0.5.1"
 gem "rails", git: "https://github.com/rails/rails.git", branch: "main"
 
 gemspec path: "../"