Leiningen 2.5.3 now available
Change effective on 16 November 2015
Heroku’s support for Clojure applications has upgraded the default Leiningen version to 2.5.3. This version will be used to build your Clojure application the next time you deploy with Git. Applications configured to use Leiningen 1.x will continue to build with version 1.7.1.