Wyo. Stat. § 14-2-607: Proceeding for rescission.

(a) A signatory may rescind an acknowledgment of paternity or denial of paternity by commencing a proceeding to rescind before the earlier of:

(i) Sixty (60) days after the effective date of the acknowledgment or denial, as provided in W.S. 14-2-604; or

(ii) The date of the first hearing in a proceeding to which the signatory is a party before a court to adjudicate an issue relating to the child, including a proceeding that establishes support.