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Ruby 2.0.0 updated to p648

Change effective on 16 December 2015

We’ve finished upgrading MRI 2.0.0 p647 to p648. Here’s a link to the MRI 2.0.0-p648 announcement. You’ll get the updated ruby runtime for your app upon next push.

Ruby 2.1.8 now available on Heroku Ruby 2.3.0-preview2 now available on Heroku