Update default builder to heroku/builder:26#572
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Switches the default integration test builder and the README usage example from heroku/builder:24 to heroku/builder:26. Also flips the CI integration test conditionals so all tests run against :26 and only stack-specific tests run against older builders. GUS-W-22580946.
edmorley
changed the title
heroku/builder:26
runesoerensen
approved these changes
May 20, 2026
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Switches the default integration test builder and the README usage example from
heroku/builder:24toheroku/builder:26.Also flips the CI integration test conditionals so all tests run against
:26and only stack-specific tests run against older builders (doing this required updating the package manager tests to use a newer historic buildpack version so the initial build can run on the new builder).GUS-W-22580946.