![]() This new build is deployed in exactly the same way as a standard build - for example there is no downtime for the stack upgrade to occur, and rollbacks can be performed in the same way. Next, a new build needs to be triggered so that a new slug is created that targets/is compatible with the new stack. First, the stack setting of the app is updated to request a change in the target stack used during the build. ![]() This slug will typically only be compatible with the stack on which it was built, so apps that have previously had a deploy must be rebuilt in order to be compatible with a new stack.Ĭhanging an existing app’s stack is a very similar process to a standard app deploy. When a Heroku app is built, the source code for your application, together with the fetched dependencies and output of the build such as the language and framework, are assembled into a bundle known as a slug. 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. ![]()
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