How to specify Heroku Clojure version?

Question

How do I tell Heroku to use a specific version of Clojure?

The sparse (and mostly out-dated) Heroku Clojure documentation only mentions:

Heroku supports apps on any production release of Clojure, running on a supported JDK version.

But not how to set the version.

Answer 1

The uberjar build artifact will include the clojure version specified in your project.clj. So just make sure this compatible with the JDK version.