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.