JRuby 9.1.0.0 now available on Heroku

Change effective on 03 May 2016

The Ruby stack now supports JRuby 9.1.0.0. To use this release, add the following code to your Gemfile:

ruby '2.3.0', :engine => 'jruby', :engine_version => '9.1.0.0'

The JRuby 9.1.0.0 release notes can be found on the JRuby website.