[Help] How can I get my puppy to sleep later?

Hi, my pup who is a 15 week old Mini Aussie is great at sleeping through the night but starts to stir at about 5am. I always take him potty whenever he wakes up as he is sleeping the entire night, and we usually just start the day from there. He goes to bed between 9-10 pm depending on how tired he is. My question is how do I train him to wake up later? Between 6-7 would be a great time, so an hour/hour and a half difference. Thanks in advance!