diff --git a/Gemfile b/Gemfile
old mode 100755
new mode 100644
index a1e202d18c8f..236d45f5b621
--- a/Gemfile
+++ b/Gemfile
@@ -40,7 +40,7 @@ group :development, :test do
   # environment is development
   gem 'rspec-rails'
   gem 'rspec-rerun'
-  gem 'rubocop'
+  gem 'rubocop', '>= 1.6.1'
   gem 'swagger-blocks'
 end