Nextcloud Version - why just Version 21?

have actual installed UCS 5.0-1 errata192 with nextcloud version 21.0.7 - is there any reason why its not last stable Nextcloud Version 23.0?
Is it possible to update to latest NC version?


I’m not involved in development just another user. Here is a GitHub repo for the app: Commits · nextcloud/univention-app · GitHub

I’ve noticed that they tend to stay one version behind the current nextcloud release.