How can I update my face recognition on my iPhone

Hey there!

Please head to the Settings app on your iPhone 13, open "FaceID & Code", enter your passcode and select "Reset FaceID"

I hope I could be of assistance.

If you encounter more issues, feel free to follow up!

Alternative Guide: How can reset my Face ID - Apple Community

See if this helps: If Face ID isn't working on your iPhone or iPad Pro - Apple Support