On Heroku, you can use any Scala version that SBT will use. I even used parallel collections in the sample app: http://devcenter.heroku.com/articles/scaling-out

On Heroku, you can use any Scala version that SBT will use. I even used parallel collections in the sample app: http://devcenter.heroku.com/articles/scaling-out-with-scala-and-akka http://devcenter.heroku.com/articles/scaling-out-with-scala-...