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!