Wyo. Stat. § 17-19-1020: Amendment by directors.

If a corporation has no members, its incorporators, until directors have been chosen, and thereafter its board of directors, may adopt one (1) or more amendments to the corporation's bylaws subject to any approval required pursuant to W.S. 17-19-1030. The corporation shall provide notice of any meeting of directors at which an amendment is to be approved. The notice shall be in accordance with W.S. 17-19-822(c). The notice shall also state that the purpose, or one (1) of the purposes, of the meeting is to consider a proposed amendment to the bylaws and contain or be accompanied by a copy or summary of the amendment or state the general nature of the amendment. The amendment shall be approved by a majority of the directors in office at the time the amendment is adopted.