Heroku-20 stack is now generally available

Change effective on 19 November 2020

Heroku-20, our stack based on Ubuntu 20.04 Long Term Support, is now out of beta and generally available. It will be supported until the end of April 2025.

The Heroku-18 stack remains the default stack for newly created applications until further notice.

If your organization uses Review Apps or Heroku CI, we recommend testing Heroku-20 by defining your stack in app.json:

   "stack": "heroku-20"

Existing apps can be upgraded by running this command and pushing a new build:

$ heroku stack:set heroku-20

The Heroku-20 stack article contains a list of changes over the Heroku-18 stack. Instructions for upgrading and testing a new stack with your app also contain information specific to Heroku-20.