diff --git a/gemfiles/rails_4_2.gemfile b/gemfiles/rails_4_2.gemfile
index c09e9c9cf..3cfa680b5 100644
--- a/gemfiles/rails_4_2.gemfile
+++ b/gemfiles/rails_4_2.gemfile
@@ -25,6 +25,8 @@ group :development, :test do
   gem 'mocha'
   gem 'pry'
   gem 'pry-remote'
+
+  gem 'rubocop', require: false
 end
 
 group :test do
diff --git a/gemfiles/rails_5_0.gemfile b/gemfiles/rails_5_0.gemfile
index 5ec13451b..0151565f7 100644
--- a/gemfiles/rails_5_0.gemfile
+++ b/gemfiles/rails_5_0.gemfile
@@ -23,6 +23,8 @@ group :development, :test do
   gem 'mocha'
   gem 'pry'
   gem 'pry-remote'
+
+  gem 'rubocop', require: false
 end
 
 group :test do
diff --git a/gemfiles/rails_5_1.gemfile b/gemfiles/rails_5_1.gemfile
index d6056a442..6cad02f05 100644
--- a/gemfiles/rails_5_1.gemfile
+++ b/gemfiles/rails_5_1.gemfile
@@ -23,6 +23,8 @@ group :development, :test do
   gem 'mocha'
   gem 'pry'
   gem 'pry-remote'
+
+  gem 'rubocop', require: false
 end
 
 group :test do