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The Heroku-18 stack reached end-of-life on April 30th, 2023. Upgrade to a newer stack as soon as possible. See the Heroku-18 End-Of-Life FAQ for more details.
This article describes the Heroku-18 stack, based on Ubuntu 18.04. What is a stack?
What’s new
This stack is now based on Ubuntu 18.04, compared to Ubuntu 16.04 used in the Heroku-16 stack.
Package installations were performed using apt-get‘s --no-install-recommends option, which removed many unneeded packages mostly related to the X11 windowing system and Tcl/Tk that were present in previous stacks, resulting in a smaller base image size.
Support period
Heroku-18 is based upon Ubuntu 18.04, and so reached end-of-life on April 30th, 2023. See the Heroku-18 End-Of-Life FAQ for more details.
Using Heroku-18
It is no longer possible to create new Heroku-18 apps, or to switch an existing app’s stack to Heroku-18. Please use a supported stack instead.