If you're running in a multiwiki setup you'll also need to define the property xwiki.store.migration.databases=all to your xwiki.cfg file or explicitly name all databases to be migrated as in xwiki.store.migration.databases=db1,db2,....

Always make sure you compare your xwiki.cfg file with the newest version since some configuration parameters were added. Note you should add xwiki.store.migration=1 so that XWiki will attempt to automatically migrate your current database to the new schema. Make sure you backup your Database before doing anything.