How to update Mediawiki
From GRA
First of all, read http://meta.wikimedia.org/wiki/Help:Upgrading_MediaWiki.
- Backup the gra_wiki database in PhpMyAdmin.
- Backup the wiki directory on the server (by FTP).
- Go to [the Meadiwiki download page] and download the latest version of MediaWiki to your hard drive.
- Extract it on your hard drive to a clean folder named wiki_new.
- Upload this folder on the server (by FTP).
- Copy the file skins/common/images/logo.gif from the wiki folder to the wiki_new folder,
- Copy the folders extensions and images from the wiki folder to the wiki_new folder.
- Copy the file LocalSettings.php from the wiki folder to the wiki_new folder.

