Titus Parks appeals the 151-month prison sentence imposed by the district court 1 following his guilty plea to distributing a mixture or substance containing cocaine base (crack cocaine). Citing United States v. Booker, 543 U.S. 220, 125 S.Ct. 738, 160 L.Ed.2d 621 (2005), Parks challenges (1) the 100:1 quantity ratio used for sentencing crack-cocaine versus powder-cocaine offenders, and (2) mandatory minimum sentences in drug cases. Upon review, we hold that Parks’s appeal is without merit. See, e.g., United States v. Castro-Higuero, 473 F.3d 880, 888 (8th Cir. 2007) (rejecting argument that Booker made mandatory minimum sentences unconstitutional); United States v. Spears, 469 F.3d 1166, 1176 (8th Cir. 2006) (en banc) (“[Neither Booker nor § 3553(a) authorizes district courts to reject the 100:1 quantity ratio and use a different ratio in sentencing defendants for crack cocaine offenses.”).

Accordingly, we affirm. See 8th Cir. R. 47B.