Refer to the Stacks article to understand what a stack is, which stacks are available, and how to determine the stack your application is currently using. This article describes how to upgrade your app to use the latest Heroku stack. See the Heroku-18 End-Of-Life FAQ for more details. Please upgrade to a newer stack as soon as possible. The Heroku-18 stack reached end-of-life on April 30th, 2023.
