RubyGems 2.1.0 includes several new features and a security update to fix CVE-2013-4287 To update to the latest RubyGems you can run: gem update --system If you need to upgrade or downgrade please follow the how to upgrade/downgrade RubyGems instructions. To install RubyGems by hand see the Download RubyGems page. Security fixes: RubyGems 2.0.7 and earlier are vulnerable to excessive CPU usage due