Referee details have changed?

Hi
one of my referee has changed their name and got a new passport issued, but the information for this referee passport i completed on the Naturalisation application refer to his old passport which is now cancelled.

Unfortunately, he did not tell me this until i had submitted my application which means i can't change it.

My biometric is in 2 weeks how should i correct/update the information please?

Thanks

Get a new declaration from the referee and upload together with an explanatory note with your other documents.