How to update shipping rates on changing postcode in guest checkout address form?

Hi guys.

I’m trying to create a module with custom shipping method. So I’ve followed the tutorial to create it. and to configure shipping carrier validations.

The problem is, if I change the zip/postcode, the shipping’s value does not change. My question is, how can I update the shipping cost value when customer update its address information (postcode to be more specific)? Or when we use the guest-checkout and there is no address information?

Thanks in advance.