Heroku Changelog JRuby 1.7.5 now available

Change effective on 11 October 2013

The Ruby stack now supports JRuby 1.7.5 in 2.0.0 (experimental), 1.9.3, 1.8.7 mode.

To use JRuby 1.7.5 in Ruby 1.9.3 mode, add this to your Gemfile:

ruby '1.9.3', :engine => 'jruby', :engine_version => '1.7.5'

Adjust the ruby value depending on the mode you wish to use.

The JRuby release notes can be found here.