JDK 13 now available

Change effective on 17 September 2019

Heroku’s support for Java, Scala, Clojure, and JRuby now includes the option of using JDK 13. To use this version, create a system.properties file in the root directory of your app with the following contents:

java.runtime.version=13

For more information on OpenJDK releases, please see the official OpenJDK documentation. For more information on supported versions and JDK vendors, please see the Dev Center guide to Java Support.