[URGENT] Told New Employer 30 Days, Actual Notice is 60 – What Should I Do?

My current company requires a 60-day notice period, but I mentioned 30 days to the new employer during the interview process. I’ve completed all interview rounds and am waiting for the offer, but now I’m unsure how to come clean about the actual notice period. Is there a better way to handle this situation?

TC: 23 LPA Experience: 3 years