Heroku-16 End-of-Life FAQ

Summary
Heroku-16, our stack based on Ubuntu 16.04 Long Term Support, is deprecated and will be end-of-life on May 1st, 2021.

Apps using the Heroku-16 stack will continue to run, but should be upgraded to a more recent stack to maintain access to security updates, technical support, and the ability to deploy new code.

Why is the Heroku-16 End-of-Life occurring?
In accordance with Heroku's stack update policy, support for Heroku stacks is synchronized with the release lifecycle of the Ubuntu Long Term Support release on which they are based. For Ubuntu 16.04, Canonical’s standard support ends in April 2021.

What is the Heroku-16 End-of-Life timetable?

  • Dec 11, 2020: Heroku-16 stack was deprecated.
  • May 1, 2021: Heroku-16 stack reaches end-of-life. It will no longer be possible to create new Heroku-16 apps. Existing Heroku-16 apps will continue to run and build, but no longer receive security updates, will receive only limited technical support, and be run at your own risk.
  • June 1, 2021: No further builds (code deployments) will be allowed for Heroku-16 apps. All other non-build functionality will continue to work, and the apps will continue to run.

Which of my apps are affected?
To list all apps that are using the Heroku-16 stack, you can run the following Heroku CLI commands:

$ heroku plugins:install apps-table
$ heroku apps:table --filter="STACK=heroku-16"

You can also show apps by team:

$ heroku apps:table --filter="STACK=heroku-16" --team=my-team-name

What resources are available to assist with upgrading your apps?
Step-by-step documentation is available to assist you with upgrading. Additionally, Heroku Enterprise customers can engage with the Customer Solutions Architecture (CSA) team to determine a strategy and timeline that works for your business.

Will Heroku-16 apps stop running? Will my app be shut down?
No. Existing Heroku-16 apps will not be shut down when the stack reaches its end-of-life, or when builds are disabled.

The apps will continue to run for the foreseeable future, and all non-build functionality will continue to work, such as:

  • Adjusting app settings
  • Adjusting app environment variables
  • Scaling app processes
  • Running one-off dynos
  • Creating/managing addons

However we highly encourage you to upgrade to a supported stack to maintain access to security updates, technical support, and ability to perform builds (deploy new code).

Will apps on the Heroku-16 stack receive technical support?
After the Heroku-16 stack reaches end-of-life on May 1st, 2021, it will no longer be a supported stack, so apps using it will only receive limited technical assistance.

Will apps on the Heroku-16 stack continue to build?
From June 1st, 2021, no further builds (code deployments) will be allowed for Heroku-16 apps until their stack is upgraded.

I upgraded my app to a supported stack but my app no longer works as expected, can I rollback to Heroku-16?
Yes, you can rollback an app that has been upgraded to a newer stack - see this Dev Center article.

My app does not have any dynos, since it's only used to hold addons. What effect will upgrading stack have on the addons?
The stack is only used by dynos run on an app, so upgrading the app's stack will have not affect the addons themselves.

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