438. During marriage, spouses may change their matrimonial regime and any stipulation in their marriage contract, provided the change itself is made by marriage contract.
Gifts made in marriage contracts, including gifts mortis causa, may be changed even if they are stipulated as irrevocable, provided that the consent of all interested persons is obtained.
If a creditor sustains damage as the result of a change to a marriage contract, he may, within one year of becoming aware of the change, obtain a declaration that it may not be set up against him.