diff --git a/Gemfile b/Gemfile
index 4a38c552834a6d89792745c26d2c18d0c7c700d9..20a0b7e6dd9c9d5af5c11bd51c25ab0bdb9bec45 100644
--- a/Gemfile
+++ b/Gemfile
@@ -8,9 +8,8 @@ group :development, :test do
   gem 'rubyzip'
   gem 'rails'
 
-  platforms :mri do
-    gem 'debugger'
-  end
+  gem 'debugger', :platforms => [:mri_19]
+  gem 'byebug', :platforms => [:mri_20, :mri_21]
 
   platforms :jruby do
     gem 'jruby-openssl'