Heroku-22 and Heroku-24 stacks updated

Change effective on 03 February 2026

We updated the heroku-22 and heroku-24 stacks to pick up security fixes in upstream packages. The new base images for each stack 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 include these changes. We automatically restart any running dynos as we roll out the new base images for each stack. For Cedar-generation apps, each time a dyno starts, the slug applies on top of the most recent base image. For Fir-generation apps, the built image gets rebased on top of the most recent base image.

If your app uses Heroku’s container stack (most don’t), 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 packages available in each stack’s base image.

Changelog of packages

Stack: heroku-22

  • Updated libc-bin from version 2.35-0ubuntu3.12 to 2.35-0ubuntu3.13
  • Updated libc-dev-bin from version 2.35-0ubuntu3.12 to 2.35-0ubuntu3.13
  • Updated libc6 from version 2.35-0ubuntu3.12 to 2.35-0ubuntu3.13
  • Updated libc6-dev from version 2.35-0ubuntu3.12 to 2.35-0ubuntu3.13
  • Updated libldap-2.5-0 from version 2.5.19+dfsg-0ubuntu0.22.04.1 to 2.5.20+dfsg-0ubuntu0.22.04.1
  • Updated libmysqlclient21 from version 8.0.44-0ubuntu0.22.04.2 to 8.0.45-0ubuntu0.22.04.1
  • Updated libssl3 from version 3.0.2-0ubuntu1.20 to 3.0.2-0ubuntu1.21
  • Updated linux-libc-dev from version 5.15.0-164.174 to 5.15.0-168.178
  • Updated locales from version 2.35-0ubuntu3.12 to 2.35-0ubuntu3.13
  • Updated openssl from version 3.0.2-0ubuntu1.20 to 3.0.2-0ubuntu1.21

Updates to packages available at build time only

  • Updated libldap-dev from version 2.5.19+dfsg-0ubuntu0.22.04.1 to 2.5.20+dfsg-0ubuntu0.22.04.1
  • Updated libldap2-dev from version 2.5.19+dfsg-0ubuntu0.22.04.1 to 2.5.20+dfsg-0ubuntu0.22.04.1
  • Updated libmysqlclient-dev from version 8.0.44-0ubuntu0.22.04.2 to 8.0.45-0ubuntu0.22.04.1
  • Updated libssl-dev from version 3.0.2-0ubuntu1.20 to 3.0.2-0ubuntu1.21

Stack: heroku-24

  • Updated inetutils-telnet from version 2:2.5-3ubuntu4 to 2:2.5-3ubuntu4.1
  • Updated libc-bin from version 2.39-0ubuntu8.6 to 2.39-0ubuntu8.7
  • Updated libc6 from version 2.39-0ubuntu8.6 to 2.39-0ubuntu8.7
  • Updated libldap2 from version 2.6.7+dfsg-1~exp1ubuntu8.2 to 2.6.10+dfsg-0ubuntu0.24.04.1
  • Updated libmysqlclient21 from version 8.0.44-0ubuntu0.24.04.2 to 8.0.45-0ubuntu0.24.04.1
  • Updated libpng16-16t64 from version 1.6.43-5ubuntu0.3 to 1.6.43-5ubuntu0.4
  • Updated libssl3t64 from version 3.0.13-0ubuntu3.6 to 3.0.13-0ubuntu3.7
  • Updated locales from version 2.39-0ubuntu8.6 to 2.39-0ubuntu8.7
  • Updated openssl from version 3.0.13-0ubuntu3.6 to 3.0.13-0ubuntu3.7

Updates to packages available at build time only

  • Updated libc-dev-bin from version 2.39-0ubuntu8.6 to 2.39-0ubuntu8.7
  • Updated libc6-dev from version 2.39-0ubuntu8.6 to 2.39-0ubuntu8.7
  • Updated libldap-dev from version 2.6.7+dfsg-1~exp1ubuntu8.2 to 2.6.10+dfsg-0ubuntu0.24.04.1
  • Updated libmysqlclient-dev from version 8.0.44-0ubuntu0.24.04.2 to 8.0.45-0ubuntu0.24.04.1
  • Updated libpng-dev from version 1.6.43-5ubuntu0.3 to 1.6.43-5ubuntu0.4
  • Updated libssl-dev from version 3.0.13-0ubuntu3.6 to 3.0.13-0ubuntu3.7
  • Updated linux-libc-dev from version 6.8.0-90.91 to 6.8.0-94.96