For GOS 21.04 new patch levels are available.
GOS 21.04.3 fixes several important issues in GOS 21.04. GOS 21.04.4 is a hotfix do address an issue with GOS 21.04.3 on some GSM hardware models.
For a complete list of changes, see the Roadmap & Lifecycle page:
In total GOS 21.04.3 covers 6 improvements and GOS 21.04.4 covers 4 improvements.