Hello,
To deliver Python 3.15 with Fedora Linux 45, we will run a coordinated rebuild in a side tag.
https://fedoraproject.org/wiki/Changes/Python3.15
Python 3.15.0b2 is scheduled for tomorrow - Tuesday, Jun 2nd 2026. We hope to start the mass rebuild shortly after it's available.
TL;DR: If you can, for the period of the mass rebuild just **don't build your Python packages in rawhide**. We will let you know when the side tag rebuild actually starts and when it is merged and it's safe to build in rawhide with Python 3.15.
Details: If you see a "Rebuilt for Python 3.15" (or similar) commit in your package, please don't rebuild it in regular rawhide or another rawhide side tag. If you need to, please let us know, so we can coordinate.
If you'd like to build a package after we already rebuilt it, you should be able to build it in the side tag via:
on branch rawhide: $ fedpkg build --target=f45-python $ koji wait-repo f45-python --request --build <nvr>
It takes time to build all the essential packages, so don't expect all your dependencies to be available right away. Any attempts to build your packages in the side tag before we do will likely fail due to missing dependencies.
When in trouble, ask here or on Fedora's Matrix - Fedora Python room (https://matrix.to/#/#python:fedoraproject.org) Ping me (ksurma) or Miro (mhroncok) if you need to talk to us.
Builds will appear here: https://koji.fedoraproject.org/koji/builds?latest=0&tagID=f45-python&...
Please avoid any potentially disturbing or major changes in Python packages until the rebuild is over.
Thanks! Karolina
Hello,
We are now starting the Python 3.15 mass rebuild in the side tag for Fedora 45 with Python 3.15.0b2.
Please, follow the original instructions when planning to build your Python packages. We'll let you know when we'll plan to merge the side tag.
And... keep your fingers crossed :) Karolina
On 6/1/26 14:45, Karolina Surma wrote:
Hello,
To deliver Python 3.15 with Fedora Linux 45, we will run a coordinated rebuild in a side tag.
https://fedoraproject.org/wiki/Changes/Python3.15
Python 3.15.0b2 is scheduled for tomorrow - Tuesday, Jun 2nd 2026. We hope to start the mass rebuild shortly after it's available.
TL;DR: If you can, for the period of the mass rebuild just **don't build your Python packages in rawhide**. We will let you know when the side tag rebuild actually starts and when it is merged and it's safe to build in rawhide with Python 3.15.
Details: If you see a "Rebuilt for Python 3.15" (or similar) commit in your package, please don't rebuild it in regular rawhide or another rawhide side tag. If you need to, please let us know, so we can coordinate.
If you'd like to build a package after we already rebuilt it, you should be able to build it in the side tag via:
on branch rawhide: $ fedpkg build --target=f45-python $ koji wait-repo f45-python --request --build <nvr>
It takes time to build all the essential packages, so don't expect all your dependencies to be available right away. Any attempts to build your packages in the side tag before we do will likely fail due to missing dependencies.
When in trouble, ask here or on Fedora's Matrix - Fedora Python room (https://matrix.to/#/#python:fedoraproject.org) Ping me (ksurma) or Miro (mhroncok) if you need to talk to us.
Builds will appear here: https://koji.fedoraproject.org/koji/builds?latest=0&tagID=f45- python&inherited=0
Please avoid any potentially disturbing or major changes in Python packages until the rebuild is over.
Thanks! Karolina
Hello,
The side tag has been merged. Now you can build Python packages in regular Rawhide with Python 3.15 safely. Shortly we'll start opening bugzillas for the remaining packages.
## What now? The usual advice
If you are aware of the problem and working towards fixing it, set your bugzilla to ASSIGNED to avoid further automated reminders. If blocked by dependencies, do not close the bugzillas as NOTABUG or DUPLICATE just because it is "not a problem in your package". The automation will file new ones anyway. Use the Blocks and Depends on fields in bugzilla instead please.
## My package fails to build because it has test failures in %check
Please, try to resolve the failures. If you are confident that the package works fine, but the tests are wrong, skip some failing tests, ideally with a link to an upstream issue. Do not disable (e.g. comment out) all tests just to unblock the rebuild of your package, it usually only hides the problem.
## My package fails to build because it has broken build dependencies
Please try to track the missing build dependencies in Bugzilla. If possible, help the maintainers of your dependencies to get them rebuilt. When in need of escalation, ask us for provenpackager help (ideally with pull requests to be merged). Once possible, rebuild your package. When you do, the bugzilla will eventually get automatically closed, but you can do that manually as well.
## My package was rebuilt with Python 3.15 but it has broken runtime dependencies
Please try to track the missing runtime dependencies in Bugzilla. If possible, help the maintainers of your dependencies to get them rebuilt. When in need of escalation, ask us for provenpackager help (ideally with pull requests to be merged). When the dependencies are rebuilt, your package will install successfully once again and the bugzilla will eventually get automatically closed, but you can do that manually as well.
## My package failed to build but installs just fine
Some packages that only require libpython3.14.so.1.0 will successfully pull in the python3.14 package as a dependency and hence they don't have installation issues. They need to be rebuilt with Python 3.15 anyway, we don't want Fedora users to pull in two Python versions unless they need them for development purposes.
## How to run things locally?
You can use mock. Make sure to: 1. Clear all caches first: $ mock -r fedora-rawhide-x86_64--scrub=all 2. Use the Koji repo: $ mock -r fedora-rawhide-x86_64 --enablerepo=local ...
## Where to get help
Reply to this thread or find us (ksurma, mhroncok) on Matrix (#python:fedoraproject.org).
Happy building, Karolina
devel-announce@lists.fedoraproject.org
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Karolina Surma