Hi,
You have probably noticed, that Ruby 2.2.0 was released [1]. I pushed the updated .spec file into dist-git and here is the scratch build:
http://koji.fedoraproject.org/koji/taskinfo?taskID=8513231
Enjoy and happy testing.
Vít
[1] https://www.ruby-lang.org/en/news/2014/12/25/ruby-2-2-0-released/