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.NET 8.0.134, 8.0.428, 9.0.124, 9.0.321, 10.0.115, 10.0.404 and 11.0.100 SDKs are now available

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Heroku now supports .NET SDK versions 8.0.134, 8.0.428, 9.0.124, 9.0.321, 10.0.115, 10.0.404, and 11.0.100 for builds.

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Also shipped Nov 10, 2026Heroku in November 2026 →

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Python 3.15 is now the default Python version

We have changed the default Python version, used by Python apps that do not specify an explicit Python version, from Python 3.14 to Python 3.15. For Cedar-generation apps this change does not affect existing apps, since the Python classic buildpack pins the Python version to the same major Python version as the previous cached build.

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Heroku-22, Heroku-24 and Heroku-26 stacks updated

We have updated the heroku-22 , heroku-24 and heroku-26 stacks to pick up security and bug fixes in upstream packages. The new base images for each stack will roll out automatically to the Common Runtime over the next 48 hours, followed by Private Spaces .

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