Well, you should always be on the latest version whenever possible :)
They typically has security and bug fixes, maybe not specifically listed, but fixes regardless:
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/reference-connect-version-history#15450
At this point you are six months behind, and a number of fixes behind. I would get caught up.
Note also that upgrading allows you to use the V2 endpoint:
https://learn.microsoft.com/en-us/azure/active-directory/hybrid/how-to-connect-sync-endpoint-api-v2