Heroku-22, Heroku-24 and Heroku-26 stacks updated

Change effective on 28 October 2026

We have updated the heroku-22, heroku-24 and heroku-26 stacks to pick up security and bug fixes in upstream packages. The new base images for each stack will roll out automatically to the Common Runtime over the next 48 hours, followed by Private Spaces.

If you use Heroku’s default buildpack-powered build system/stacks, you don’t need to redeploy your app to receive these changes. For Cedar-generation apps, each time a dyno starts, the slug is overlaid on top of the most recent base image. For Fir-generation apps, the built image is rebased on top of the most recent base image.

If your app uses Heroku’s container stack, you must rebuild your app’s Docker image to pick up updates in the base image specified in your Dockerfile.

See this Dev Center article for an overview of the package versions available in each stack’s base image.

The Heroku-22 stack is deprecated and will reach end-of-life on April 30th, 2027. Upgrade to a newer stack as soon as possible. See the Heroku-22 End-Of-Life FAQ for more details.

Changelog of packages

Stack: heroku-22

  • Updated libbrotli1 from version 1.0.9-2build6 to 1.0.9-2ubuntu0.1
  • Updated linux-libc-dev from version 5.15.0-198.208 to 5.15.0-202.212

Updates to packages available at build time only

  • Updated libbrotli-dev from version 1.0.9-2build6 to 1.0.9-2ubuntu0.1

Stack: heroku-24

  • Updated libbrotli1 from version 1.1.0-2build2 to 1.1.0-2ubuntu0.1
  • Updated zlib1g from version 1:1.3.dfsg-3.1ubuntu2.2 to 1:1.3.dfsg-3.1ubuntu2.3

Updates to packages available at build time only

  • Updated libbrotli-dev from version 1.1.0-2build2 to 1.1.0-2ubuntu0.1
  • Updated zlib1g-dev from version 1:1.3.dfsg-3.1ubuntu2.2 to 1:1.3.dfsg-3.1ubuntu2.3

Stack: heroku-26

  • Updated libbrotli1 from version 1.2.0-3build1 to 1.2.0-3ubuntu0.1
  • Updated zlib1g from version 1:1.3.dfsg+really1.3.1-1ubuntu3.1 to 1:1.3.dfsg+really1.3.1-1ubuntu3.2

Updates to packages available at build time only

  • Updated libbrotli-dev from version 1.2.0-3build1 to 1.2.0-3ubuntu0.1
  • Updated linux-libc-dev from version 7.0.0-38.38 to 7.0.0-42.42
  • Updated zlib1g-dev from version 1:1.3.dfsg+really1.3.1-1ubuntu3.1 to 1:1.3.dfsg+really1.3.1-1ubuntu3.2