How do you update an expired? Card

See this article about updating payment methods on various platforms (iPhone, Mac, etc.): If you need to change or update your Apple ID payment method - Apple Support

Also note: "If you change your address, the credit or debit card information that you use with your Apple ID might be automatically updated by your financial institution, and you don't need to take action. But if there's an issue [such as you having a subscription or being a Family Sharing Organizer], add a new card first, then remove the old card."

See this instructions on how to update your payment method

1. Open the Settings app.
2. Tap your name.
3. Tap Media & Purchases, then tap View Account. You may be asked to sign in with your Apple ID.
4. Tap Manage Payments.
5. Tap Add Payment Method.

 6. Enter the payment method details, then tap Done.