If you log into your account, you will see an Edit button at the bottom right, next to your credit card details. Just click the Edit button and you will be able to change your details on the next page. The area may look grayed out but you will be able to type your new credit card number, expiry date and CVC number.
If you are updating to a new card and are a US or International subscriber, you may want to contact your bank. Some banks and card companies automatically block international purchases and as we are a Canadian company, this happen sometimes.
You just need to give your bank a quick call and let them know you authorize the OwlCrate purchase.
This will help make sure your future renewals go through smoothly.