Are unilateral contract amendments valid?

Most contract amendments require the agreement and signatures of all parties to the contract in order to be valid and enforceable.

Under certain limited circumstances, a unilateral amendment, or an amendment where just one party to the agreement makes an enforceable change, may be used. However, such situations are not very common. Examples of unilateral contracts include credit card agreements where the cardholder’s continued use of the card after receiving notice of an amendment constitutes his or her agreement to the changes, or software licensing agreements where the user’s continued use of the software is deemed acceptance of revised contract terms.

Most business agreements are bilateral contracts, meaning all parties to the agreement must agree to add to, delete, or change terms and provisions of the contract.

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