Change effective on 30 January 2015
Heroku’s support for Play 1.x applications has upgraded the default version to 1.3.0. You can return to a previous version or define a specific version of the Play framework by configuring your
conf/dependencies.yml file in this way:
require: - play 1.2.7
Supported versions include:
Support for Play 2.x applications is still provided by the Heroku Scala buildpack.