Wyo. Stat. § 26-33-109: Contents of policies.

Any policy issued under this chapter is presumed to comply with this chapter. The insurer assumes all obligations to pay an award imposed against its insured under this chapter and no policy termination by cancellation is effective unless at least ninety (90) days before the effective date of the cancellation both the insured and the commissioner receive at their offices, a written notice giving the date upon which termination is effective.