Thread:Project:Support desk/Does an upgrade influence the structure?/reply (6)

Note, well newer versions use vector by default, your options from your old install will carry through, so if you're upgrading your wiki will stay monobook unless you change it.

Newer versions do have security fixes that are important, but they also have a multitude of new features. Look at the HISTORY file including in a new version of MediaWiki for a _big_ list of changes.