Heroku-18 and Heroku-20 Stack Images Updated

Change effective on 09 September 2021

We have updated the heroku-18 and heroku-20 stack images to pick up security fixes in upstream packages. The new stack images will be rolled out automatically over the next 24 hours. You do not need to redeploy your app or manually restart your dynos.

See this Dev Center article for an overview of the packages available in each stack image.

Changelog of packages

The following packages have been changed; a separate section for each stack (if applicable) lists packages that are only available at build time, but not at runtime.

Stack: heroku-18

  • Updated libgd3 from version 2.2.5-4ubuntu0.4 to 2.2.5-4ubuntu0.5
  • Updated libssl1.0.0 from version 1.0.2n-1ubuntu5.6 to 1.0.2n-1ubuntu5.7
  • Updated linux-libc-dev from version 4.15.0-154.161 to 4.15.0-156.163

Updates to packages available at build time only

  • Updated libgd-dev from version 2.2.5-4ubuntu0.4 to 2.2.5-4ubuntu0.5

Stack: heroku-20

  • Updated libgd3 from version 2.2.5-5.2ubuntu2 to 2.2.5-5.2ubuntu2.1
  • Updated libssh-4 from version 0.9.3-2ubuntu2.1 to 0.9.3-2ubuntu2.2
  • Updated linux-libc-dev from version 5.4.0-81.91 to 5.4.0-84.94

Updates to packages available at build time only

  • Updated libgd-dev from version 2.2.5-5.2ubuntu2 to 2.2.5-5.2ubuntu2.1