How to update my Apple Watch?

You will have to update it yourself.

Update directly on your Apple Watch

1. Make sure that your watch is connected to Wi-Fi.
2. On your watch, open the Settings app.
3. Tap General > Software Update.
4. Tap Install if a software update is available, then follow the onscreen instructions.

Update your Apple Watch - Apple Support (IN)

My watch says it’s up to date but hasn’t since October. Not sure how to manually do it