Hello everyone,
with the release of MediaWiki 1.23 LTS (Long Term Support), the lifetime of MediaWiki version 1.21 ends. There will be a final maintenance release on 25th of June, 2014.
The new legacy version is 1.22. Users still using MediaWiki 1.21 are advised to upgrade to version 1.23.0 (latest stable) or 1.22.7 (legacy version).
MediaWiki 1.19 LTS will continue to be supported until May, 2015.
Best,
Markus Glaser
(Release Team)