Heroku-16, Heroku-18 and Heroku-20 Stack Images Updated

Change effective on 03 December 2020

We have updated the heroku-16, 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-16

  • Updated linux-libc-dev from version 4.4.0-194.226 to 4.4.0-197.229

Stack: heroku-18

  • Updated libruby2.5 from version 2.5.1-1ubuntu1.6 to 2.5.1-1ubuntu1.7
  • Updated linux-libc-dev from version 4.15.0-124.127 to 4.15.0-126.129
  • Updated ruby2.5 from version 2.5.1-1ubuntu1.6 to 2.5.1-1ubuntu1.7

Updates to packages available at build time only

  • Updated ruby2.5-dev from version 2.5.1-1ubuntu1.6 to 2.5.1-1ubuntu1.7

Stack: heroku-20

  • Updated libmysqlclient21 from version 8.0.22-0ubuntu0.20.04.2 to 8.0.22-0ubuntu0.20.04.3
  • Updated libruby2.7 from version 2.7.0-5ubuntu1.1 to 2.7.0-5ubuntu1.2
  • Updated linux-libc-dev from version 5.4.0-54.60 to 5.4.0-56.62
  • Updated ruby2.7 from version 2.7.0-5ubuntu1.1 to 2.7.0-5ubuntu1.2

Updates to packages available at build time only

  • Updated libmysqlclient-dev from version 8.0.22-0ubuntu0.20.04.2 to 8.0.22-0ubuntu0.20.04.3
  • Updated ruby2.7-dev from version 2.7.0-5ubuntu1.1 to 2.7.0-5ubuntu1.2