Ruby is up to 2.2.2

[konklone]

Includes some memory reduction work:

https://www.ruby-lang.org/en/news/2014/09/19/ruby-2-1-3-is-released/

[konklone]

Ruby is up to 2.2.2 now: https://www.ruby-lang.org/en/news/2015/04/13/ruby-2-2-2-released/