DS218+ stuck on DSM 7.1.1 ?

Just wondering, my DS218+ shows current DSM version is DSM 7.1.1-42962 Update 9 - and "Your DSM version is up to date"

Is that end of service for me or do I need to upgrade manually?

On official DS218+ page it goes up to 7.4 >> [https://www.synology.com/en-us/releaseNote/DSM?model=DS218%2B](https://www.synology.com/en-us/releaseNote/DSM?model=DS218%2B)

Update: thanks for all replies. Will look into a manual update then.

Update 2: Running DSM 7.4 now - thanks to all!