Nextcloud Hub II - Unable to update 3.0.3 -> 3.0.5

I have an update problem. Nextcloud tells me that the update software is too old and therefore does not want to update my Nextcloud.

When I click on the update button, it takes me back to the homepage.

[PHP] Erreur: Function libxml_disable_entity_loader() is deprecated at /var/www/html/lib/private/Updater/VersionCheck.php#100