17 year old broke curfew what should I do?

Last night my teenager went out with friends after dance practice. These dances often end up getting extended and go until 10:00, 10:30 even 11:00 in some instances. His curfew is 11:30 which he claims is too early and reluctantly adheres to for the most part. He texted me at around 11 that practice went long and he wants to stay out longer with friends and that he will be home around 12. I agree to this and that was that.Meanwhile I woke up around 1:30 and check to see if his car was in the drive way and it wasn’t so I called him to see what’s up. He answers on the second try and says an old friend from soccer called him up and saw he was in the area on “snap maps”. He hasn’t seen the guy for over a year now. He claims they just walked around the park and goofed off and caught up claiming “you know how it is when u meet up with someone you haven’t seen in years and you just never run out of things to say?” I asked him how come he wasn’t home yet and he told me “I wasn’t sure if your ringer was on I didn’t want to wake you up I was just going to tell you in the morning” anyway he then asked if he had to drive his brother to practice and I said yes.He woke up at 7:30 and drove his brother to practice with no issues.The only issue I have is that I don’t know how to discipline him for disobeying his even further extended curfew? via /r/Parenting https://ift.tt/3hsQaTq