PER CURIAM:
Robert Payne Watson, Jr., appeals his conviction for failing to register as a sex offender, in violation of 18 U.S.C. § 2250(a). He contends that the Sex Offender Registration and Notification Act (SORNA), 42 U.S.C. §§ 16901-62, violates the Ex Post Facto Clause. We rejected the same challenge to SORNA in United States v. Young, 585 F.3d 199, 204-05 (5th Cir.2009), and again in United States v. Johnson, 632 F.3d 912, 917-18 (5th Cir.2011). We cannot overrule the decision of another panel absent an en banc or superseding Supreme Court decision. See United States v. Lipscomb, 299 F.3d 303, 313 n. 34 (5th Cir.2002). As such, the judgment of the district court is AFFIRMED.
Pursuant to 5th Cir. R. 47.5, the court has determined that this opinion should not be published and is not precedent except under the limited circumstances set forth in 5th Cir. R. 47.5.4.