diff --git a/Gemfile b/Gemfile
index 278ec8a..c49247c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -20,6 +20,6 @@ group :test do
 end
 
 platforms :rbx do
-  gem 'rubysl', '~> 2.0'
-  gem 'rubinius-coverage'
+  gem "rubysl", "~> 2.1"
+  gem "rubinius-coverage"
 end