A jury found Fernando Canales-Mendo-za (Canales) guilty of distributing over 5 grams of actual methamphetamine, possessing with intent to distribute over 50 grams of actual methamphetamine, and conspiring to distribute methamphetamine. The district court 1 thereafter imposed concurrent sentences totaling 120 months in prison—the mandatory statutory minimum, which represented a one-month downward variance from the Guidelines range—plus five years of supervised release. On appeal, in a brief filed under Anders v. California, 386 U.S. 738, 87 S.Ct. 1396, 18 L.Ed.2d 493 (1967), Canales’s counsel challenges the sufficiency of the evidence to support the convictions, and the substantive reasonableness of the sentence. In a pro se supplemental brief, Canales argues he was eligible for safety-valve relief. For the reasons that follow, we affirm.

Following careful review, we conclude that the evidence establishing three undercover buys of methamphetamine, with resale quantities involved, supported Canales’s convictions. See United States v. Vore, 743 F.3d 1175, 1180-81 (8th Cir. 2014) (standard of review); United States v. Peeler, 779 F.3d 773, 776 (8th Cir. 2015) (conspiracy); United States v. Tomberlin, 130 F.3d 1318, 1319 (8th Cir. 1997) (distribution). As to sentencing issues, Canales did not meet his burden to prove that he qualified for safety-valve relief, given representations by both the government and defense counsel that Canales did not engage in the necessary proffer, see 18 U.S.C. § 3553(f)(5); U.S.S.G. § 5C1.2(a); United States v. O’Dell, 204 F.3d 829, 838 (8th Cir. 2000); and the reasonableness challenge to his statutory minimum sentence fails, see United States v. Vieth, 397 F.3d 615, 620 (8th Cir. 2005).

After independent review under Penson v. Ohio, 488 U.S. 75, 109 S.Ct. 346, 102 *575 L.Ed.2d 300 (1988), we find no nonfrivo-lous issue. Accordingly, the judgment is affirmed, and counsel’s motion to withdraw is granted.