Derek Ernest Austin appeals the 120-month sentence imposed following his guilty plea conviction for being a felon in possession of ammunition. He argues that his sentence is unconstitutional in light of United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), because it was based on facts not presented to a jury and to which he did not admit. The Government seeks to enforce the appeal waiver provision in Austin’s plea agreement and moves for summary affirmance or dismissal.

Austin’s appeal waiver was knowing and voluntary, and therefore, the waiver is enforced. See United States v. Melancon, 972 F.2d 566, 567-68 (5th Cir. 1992). Moreover, Austin’s argument does not come within one of the enumerated exceptions to his appeal waiver. As such, we do not address the merits of Austin’s challenge to his sentence.

The judgment of the district court is AFFIRMED. The Government’s motion for summary affirmance is GRANTED. The Government’s motion to dismiss is DENIED. The Government’s alternative motion for an extension of time is DENIED as moot.