Nicolas Buckett, proceeding pro se, appeals the 135-month sentence imposed following his guilty-plea conviction for conspiracy to possess with the intent to distribute more than 500 grams of methamphetamine, in violation of 21 U.S.C. § 846. He argues, for the first time on appeal, that his sentence is error because he should have received a safety-valve reduction, pursuant to U.S.S.G. § 5C1.2. The Government moves for summary af-firmance or dismissal, urging that the appeal is barred by the waiver-of-appeal provision of Buckett’s plea agreement. Alternatively, the Government seeks an extension of time to file a merits brief.

Our review of the record shows that Buckett’s appeal waiver was knowing and voluntary and that, under the plain language of the plea agreement, the waiver applies to the circumstances at hand. See United States v. Burns, 433 F.3d 442, 445-46 (5th Cir. 2005); United States v. McKinney, 406 F.3d 744, 746 (5th Cir. 2005). Accordingly, Buckett’s appeal waiver bars review of the issue he seeks to raise on appeal.

The judgment of the district court is AFFIRMED, the Government’s motion for summary affirmance is GRANTED, and the Government’s motions for dismissal or an extension of time are DENIED.