Wyo. Stat. § 1-16-401

(a) A district court may vacate or modify its own judgment or order after the term at which it was made:

(i) By granting a new trial when the grounds for a new trial could not with reasonable diligence have been discovered before, but are discovered after the original motion for a new trial has been passed upon by the district court;

(ii) By a new trial granted in proceedings against defendants constructively summoned;

(iii) For mistake, neglect or omission of the clerk or irregularity in obtaining a judgment or order;

(iv) For fraud practiced by the successful party in obtaining a judgment or order;

(v) For erroneous proceedings against a minor or person of unsound mind, when the condition of the defendant does not appear in the record nor the error in the proceedings;

(vi) For the death of the parties before judgment in the action;

(vii) For unavoidable casualty or misfortune preventing the party from prosecuting or defending;

(viii) For errors in a judgment shown by a minor within twelve (12) months after arriving at the age of majority;

(ix) For taking judgments upon warrants of attorney for more than was due the plaintiff, when the defendant was not summoned or otherwise legally notified of the time and place of taking the judgment;

(x) When the judgment or order was obtained in whole or in a material part by false testimony on the part of the successful party or any witness in his behalf which ordinary prudence could not have anticipated or guarded against and the guilty party has been convicted.