diff --git a/Gemfile.devtools b/Gemfile.devtools
index 73de6d21..c28a4f9b 100644
--- a/Gemfile.devtools
+++ b/Gemfile.devtools
@@ -8,6 +8,7 @@ group :development do
 
   platform :rbx do
     gem 'rubysl-singleton', '~> 2.0.0'
+    gem 'rubinius-coverage', '~> 2.0.1'
   end
 end
 
@@ -38,7 +39,7 @@ group :metrics do
   gem 'flay',      '~> 2.5.0'
   gem 'flog',      '~> 4.2.1'
   gem 'reek',      '~> 1.3.7'
-  gem 'rubocop',   '~> 0.26.1'
+  gem 'rubocop',   '~> 0.26.0'
   gem 'simplecov', '~> 0.7.1'
   gem 'yardstick', '~> 0.9.9'