N.D. Cent. Code § 9-09-05 : — CONTRACTS AND OBLIGATIONS09 - EXTINCTION, RESCISSION, ALTERATION, AND CANCELLATION —09-05 - Alteration of oral contract

A contract not in writing may be altered in any respect by consent of the parties in writing without a new consideration, or by oral consent of the parties with a new consideration, and is extinguished thereby to the extent of the alteration.