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.