While Keeyon Dunbar was serving a period of supervised release on a federal criminal sentence, he admitted to the district court 1 that he had violated his release conditions. The court revoked supervised release and imposed a within-Guidelines-range revocation sentence' of 11 months in prison. On appeal, Dunbar contends that the sentence is substantively unreasonable. Upon careful review of the record, we conclude that the court did not abuse its discretion. See United States v. Miller, 557 F.3d 910, 915-16 (8th Cir. 2009) (standard of review). The judgment is affirmed, and we grant counsel leave to withdraw.