Here is the breakdown of the versions of MediaWiki that we've found. If you're not in the upper left quadrant of this pie chart, then you're seriously behind the current security patches and feauture set offered by MediaWiki. Find out the version of your wiki with a free Wiki Report. With a proper Development / Operations environment for your wiki, it becomes easy to maintain.
DevOps is a specialty of eQuality Technology and MediaWiki is our passion. Contact us for answers.
All beta releases and release candidates have been merged into their respective 'whole number' release versions for purposes of illustration