forgot change address v5c - mel2014

help, ive forgotten to update my v5c of change of address , it was last year i bought the car. what will happen, what can i do? the car is being dismantled due to being a rtotal loss,and i just found my v5c and seen the old address on it. my insurance company need thev5c returned but its got the old address on it. should i return the v5c to dvlc and then it will be updated, and then send back to the insurance company? only thing is they need it back soon and dvlc take time to return my v5c . also im buying another car this week, so i am in a muddle and want this done properly. will i get fined for not updating sooner?