The wiki is currently powered by MediaWiki 1.35 (legacy LTS) whose end-of-life will be reached in September.

The next LTS is already available as 1.39 since last November.

It "supports upgrades from two LTS releases ago".

References:

• Version lifecycle
• Manual:Upgrading

Release notes:

• 1.36
• 1.37
• 1.38
• 1.39