dev-ruby/pygments_rb-0.6.3 is the latest version in the repo, but version 1+ is out. Thanks!
https://github.com/tmm1/pygments.rb/blob/master/CHANGELOG.md
pygments.rb didn't show up on our "outdated gems" list. This is now fixed. Unfortunately pygments.rb 1.1.2 has a number of test failures that need further investigation before we can add it.
pygments_rb 1.1.2 has now been added.