Heroku-18 and Heroku-20 Stack Images Updated

Change effective on 09 June 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 liblz4-1 from version 0.0~r131-2ubuntu3 to 0.0~r131-2ubuntu3.1
• Updated libpam-modules from version 1.1.8-3.6ubuntu2.18.04.2 to 1.1.8-3.6ubuntu2.18.04.3
• Updated libpam-modules-bin from version 1.1.8-3.6ubuntu2.18.04.2 to 1.1.8-3.6ubuntu2.18.04.3
• Updated libpam-runtime from version 1.1.8-3.6ubuntu2.18.04.2 to 1.1.8-3.6ubuntu2.18.04.3
• Updated libpam0g from version 1.1.8-3.6ubuntu2.18.04.2 to 1.1.8-3.6ubuntu2.18.04.3
• Updated libwebp6 from version 0.6.1-2 to 0.6.1-2ubuntu0.18.04.1
• Updated libwebpdemux2 from version 0.6.1-2 to 0.6.1-2ubuntu0.18.04.1
• Updated libwebpmux3 from version 0.6.1-2 to 0.6.1-2ubuntu0.18.04.1
• Updated libx11-6 from version 2:1.6.4-3ubuntu0.3 to 2:1.6.4-3ubuntu0.4
• Updated libx11-data from version 2:1.6.4-3ubuntu0.3 to 2:1.6.4-3ubuntu0.4
• Updated linux-libc-dev from version 4.15.0-143.147 to 4.15.0-144.148

Updates to packages available at build time only

• Updated libarchive13 from version 3.2.2-3.1ubuntu0.6 to 3.2.2-3.1ubuntu0.7
• Updated liblz4-dev from version 0.0~r131-2ubuntu3 to 0.0~r131-2ubuntu3.1
• Updated libpam0g-dev from version 1.1.8-3.6ubuntu2.18.04.2 to 1.1.8-3.6ubuntu2.18.04.3
• Updated libx11-dev from version 2:1.6.4-3ubuntu0.3 to 2:1.6.4-3ubuntu0.4

Stack: heroku-20

• Updated liblz4-1 from version 1.9.2-2 to 1.9.2-2ubuntu0.20.04.1
• Updated libpam-modules from version 1.3.1-5ubuntu4.1 to 1.3.1-5ubuntu4.2
• Updated libpam-modules-bin from version 1.3.1-5ubuntu4.1 to 1.3.1-5ubuntu4.2
• Updated libpam-runtime from version 1.3.1-5ubuntu4.1 to 1.3.1-5ubuntu4.2
• Updated libpam0g from version 1.3.1-5ubuntu4.1 to 1.3.1-5ubuntu4.2
• Updated libpython3.8-minimal from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3
• Updated libpython3.8-stdlib from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3
• Updated libwebp6 from version 0.6.1-2 to 0.6.1-2ubuntu0.20.04.1
• Updated libwebpdemux2 from version 0.6.1-2 to 0.6.1-2ubuntu0.20.04.1
• Updated libwebpmux3 from version 0.6.1-2 to 0.6.1-2ubuntu0.20.04.1
• Updated libx11-6 from version 2:1.6.9-2ubuntu1.1 to 2:1.6.9-2ubuntu1.2
• Updated libx11-data from version 2:1.6.9-2ubuntu1.1 to 2:1.6.9-2ubuntu1.2
• Updated linux-libc-dev from version 5.4.0-73.82 to 5.4.0-74.83
• Updated python3.8 from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3
• Updated python3.8-minimal from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3

Updates to packages available at build time only

• Updated liblz4-dev from version 1.9.2-2 to 1.9.2-2ubuntu0.20.04.1
• Updated libpam0g-dev from version 1.3.1-5ubuntu4.1 to 1.3.1-5ubuntu4.2
• Updated libpython3.8 from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3
• Updated libpython3.8-dev from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3
• Updated libx11-dev from version 2:1.6.9-2ubuntu1.1 to 2:1.6.9-2ubuntu1.2
• Updated python3-distutils from version 3.8.5-1~20.04.1 to 3.8.10-0ubuntu1~20.04
• Updated python3-lib2to3 from version 3.8.5-1~20.04.1 to 3.8.10-0ubuntu1~20.04
• Updated python3.8-dev from version 3.8.5-1~20.04.2 to 3.8.5-1~20.04.3