Rob Church wrote:
MediaWiki releases contain complete copies of the software which should replace all the existing files of the previous version. The LocalSettings.php file can be left unaltered.
When upgrading within the same branch, i.e. from 1.X.Y to 1.X.Z, it is unusual to find large schema alterations made. Therefore, it is sufficient in most cases to replace the existing files with the new ones. If database errors do occur, then the maintenance/update.php script can be run from the command line to check and alter the database as needed.
this may not be sufficient, because it could let the configure directory unaltered.
at least you must delete this directory after copying.
may be verify the image directory permissions if applicable.
jdd