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Ruby 2.1.0 now supported on Heroku

Change effective on 25 December 2013

Ruby v2.1.0 is now available on Heroku. To run your app using this version of Ruby, add the following ruby directive to your Gemfile:

ruby "2.1.0"

JSON Schema for the Heroku Platform API Ruby 2.1.0 rc1 now supported on Heroku