As per the MediaWiki version lifecycle[1], I would like to announce the formal end of life (EOL) of MediaWiki 1.36 as of today, Friday June 3, 2022.
This means that MediaWiki 1.36 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 1.37, which will be supported until November 2022 or to 1.38 (released yesterday), which will be supported until June 2023.
Thanks!
Sam Reed