As per the MediaWiki version lifecycle[1], I would like to announce the formal end of life (EOL) of MediaWiki 1.37 as of today, Wednesday November 30, 2022.
This means that MediaWiki 1.37 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 MediaWiki 1.38, which will be supported until June 2023 or to 1.39 (released today), the next LTS after 1.35, which will be supported until November 2025.
Thanks!
Sam Reed
mediawiki-announce@lists.wikimedia.org