Released version 2.3.1 and Extension 2.3.1. In general, this version includes only fixes the list of which you can read bellow.
This version doesn’t have any database update. To update from 2.3 to 2.3.1 just rewrite all files, except /config/server.php
If you are using the Extension, only files must be overwritten to upgrade from 2.3 to 2.3.1.