Ruby 2.3.0-preview2 now available on Heroku
Change effective on 11 December 2015
This release replaces Ruby 2.3.0-preview1. You’ll automatically get this update when you deploy next.
Note: This version of Ruby is not suitable for production applications. However, it can be used to test that your application is ready for December release of Ruby 2.3.0 and to provide feedback to the Ruby core team.