Scala 2.13.11 release planning

This thread is for updates and discussions about the upcoming Scala 2.13.11 release.

The two main motivations for the release are:

  • Scala 3.3.0 will be released sometime soon (3.3.0-RC2 is already out), and a new Scala 2.13 release is needed for the TASTy reader to support reading 3.3’s TASTy. (The necessary changes, by Jamie Thompson, have already been merged.)
  • We aim to release every 3–6 months. 2.13.10 came out on 8 Oct 22, so it’s now been over 4 months which means it’s getting to be time anyway.

The 2.13.11 milestone on GitHub has lists of open and merged PRs for the release. You may wish to filter by the “release-notes” label to see only the most significant changes.

Feel free to use this thread to ask questions and share concerns about the timing and contents of the release.


Oh, I should have mentioned that another reason to do 2.13.11 is to ship JDK 20 support in the optimizer (support was already merged). We should do 2.12.18 at about the same time for the same reason; see the 2.12.18 release planning thread.


We’ve just finished QAing the current 2.13 nightly on JDK 20 and all is well. Our test suite is green and will run nightly on JDK 20 from now on, and the same is true of the Scala 2.13 community build.

An update on timing: 3.3.0 is a bit delayed (not before April 17, is my understanding, since we don’t have RC4 yet), so that pushes 2.13.11 until at least April 20.