As per the MediaWiki version lifecycle[1], I would like to announce the
formal end of life (EOL) of MediaWiki 1.39 as of December 31, 2025.
1.39.17 is expected to be the last release for this branch.
This means that MediaWiki 1.39 will no longer receive maintenance or
security backports. It is therefore strongly discouraged that you continue
to use it.
It is recommended to upgrade either to the next LTS, 1.43, which will be
supported until the end of December 2027. Or to either MediaWiki 1.44,
which will be supported until the end of July 2026, or to MediaWiki 1.45,
which will be supported until the end of December 2026.
Thanks!
[1] https://www.mediawiki.org/wiki/Version_lifecycle
Hi all,
This week, either on Tuesday or Wednesday, we will be issuing a security
and maintenance release to all supported branches of MediaWiki.
The new releases will be:
- 1.39.16
- 1.43.6
- 1.44.3
- 1.45.1
This will also resolve security issues in bundled extensions, along with
bug fixes included for maintenance reasons.
These security issues also affect many unsupported versions of MediaWiki.
We will make the fixes available in the respective release branches and
master in git. Tarballs will be available for the above mentioned point
releases as well.
A summary of some of the security fixes that have gone into non-bundled
MediaWiki extensions will also follow later.
As a reminder, MediaWiki 1.35 became end of life (EOL) in December 2023,
MediaWiki 1.40 became EOL in June 2024, MediaWiki 1.41 became EOL in
December 2024 and MediaWiki 1.42 became EOL in June 2025.
MediaWiki 1.39 (the old LTS before 1.43) becomes EOL at the end of the
month - December 2025. It is strongly recommended to upgrade to 1.43 (the
next LTS after 1.39), which will be supported until December 2027.
A formal EOL email for MediaWiki 1.39 will come later this month. This is
because as per our support policy, it is to be supported until the end of
the month, but we are not expecting any further changes to be made to the
branch.
More information on these timelines can be viewed on the Version lifecycle
page at [1].
[1] https://www.mediawiki.org/wiki/Version_lifecycle
Hey all,
This is a quick note to highlight that we've created the REL1_45 branch for
MediaWiki core and each of the extensions and skins in Wikimedia git [0].
This is the first step in the release process for MediaWiki 1.45.0, which
should be out in late November 2025, approximately six months after
MediaWiki 1.44.0.
The branches reflect the code as of the last 'alpha' branch for the
release, 1.45.0-wmf.25, which was deployed to Wikimedia wikis on Tuesday,
28 October 2025, for MediaWiki itself and those extensions and skins
available there.
From now on, patches that land in the main development branch of MediaWiki
and its bundled extensions and skins will be slated for the MediaWiki 1.46
release, unless specifically backported [1].
If you are working on a critical bug fix that will affect the code in the
release, once the patch has been merged into the development branch, you
should propose it for backporting by cherry-picking to the REL1_45 branch.
If you are working on a new feature, that should now not be backported. If
you have an urgent case where the work should block release for everyone
else, please file a task against the `mw 1.45-release` project on
Phabricator [2].
If you have tickets that are tagged for `mw-1.45-release`, please finish
them, untag them, or reach out to get them resolved in the next few days.
We hope to issue the first release candidate, 1.45.0-rc.0, in two weeks'
time, and if all goes well, to then release MediaWiki 1.45.0 a few weeks
after that.
[0]: https://www.mediawiki.org/wiki/Bundled_extensions_and_skins
[1]: https://www.mediawiki.org/wiki/Backporting_fixes
[2]: https://phabricator.wikimedia.org/tag/mw-1.45-release/
Best regards,
--
Mateus Santos (he/him)
Product Manager MediaWiki Engineering Group
Hey all,
This is a quick note to highlight that in three weeks' time, the REL1_45
branch will be created for MediaWiki core and each of the extensions and
skins in Wikimedia git, with some (the 'tarball') included as sub-modules
of MediaWiki itself[0]. This is the first step in the release process for
MediaWiki 1.45, which should be out in November 2025, approximately six
months
after MediaWiki 1.44.
The branches will reflect the code as of the last 'alpha' branch for the
release, 1.45.0-wmf.25, which will be deployed to Wikimedia wikis in the
week beginning 28 October 2025 for MediaWiki itself and those extensions
and skins available there.
After that point, patches that land in the main development branch of
MediaWiki and its bundled extensions and skins will be instead be slated
for the MediaWiki 1.45 release unless specifically backported[1].
If you are working on a new feature that you wish to land for the release,
you now have a few days to finish your work and land it in the development
branch; feature changes should not be backported except in an urgent case.
If your work might not be complete in time, and yet should block release
for everyone else, please file a task against the `mw-1.45-release` project
on Phabricator.[2]
If you have tickets that are already tagged for `mw-1.45-release`, please
finish them, untag them, or reach out to get them resolved in the next few
weeks.
We hope to issue the first release candidate, 1.45.0-rc.0, two weeks after
the branch point, and if all goes well, to release MediaWiki 1.45.0 a few
weeks after that.
[0]: <https://www.mediawiki.org/wiki/Bundled_extensions_and_skins>
[1]: <https://www.mediawiki.org/wiki/Backporting_fixes>
[2]: <https://phabricator.wikimedia.org/tag/mw-1.45-release/>