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Scala buildpack adds support for Play 2.4
Change effective on 28 May 2015
Heroku’s Scala buildpack has added support for Play Framework 2.4. New Play 2.4 applications can be deployed according to the Getting Started with Play documentation. Existing applications can be upgraded by following the instructions from the Play Framework website.
For more information, see the Dev Center article on Scala support or the Play Framework documentation.