Wyo. Stat. Ann. § 15-9-125

If any of the public officials of the municipality whose signatures appear on any bonds or coupons issued under this chapter cease to be officials before the delivery of the bonds, the signatures are valid and sufficient for all purposes, the same as if the officials had remained in office until the delivery. Any provision of any law to the contrary notwithstanding, any bonds issued pursuant to this chapter are fully negotiable.