SUMMARY ORDER

Defendant-Appellant Keith Jennings appeals from a decision and order by the district court for the Northern District of New York (McAvoy, J.) denying his motion for a reduction of his sentence pursuant to 18 U.S.C. § 3582(c)(2). We assume the parties’ familiarity with the underlying facts, the procedural history of the ease, and the issues on appeal.

“A district court may not generally modify a term of imprisonment once it has been imposed[,l” but 18 U.S.C. § 3582(c)(2) provides a limited exception that allows a district court to “reduce the term of imprisonment of a defendant who *441has been sentenced to a term of imprisonment based on a sentencing range that has subsequently been lowered by the Sentencing Commission [ (“Commission”) ]....” Cortorreal v. United States, 486 F.3d 742, 744 (2d Cir. 2007) (per curiam) (internal quotation marks omitted). In 2007 and 2008, the Commission amended the United States Sentencing Guidelines by reducing the recommended Guidelines sentence for offenses involving cocaine base (collectively, the “crack-cocaine amendments”). See, e.g., U.S.S.G. app. C, amend. 706 (2007), as amended by amend. 711; id. amend. 715 (2008). The crack-cocaine amendments were made retroactive, subject to certain conditions. See U.S.S.G. § 1B1.10. Relying upon these amendments,1 Jennings filed a motion for a reduced sentence under § 3582(c)(2) on February 22, 2008. In an order filed on April 15, 2008, the district court denied the motion after concluding that Jennings was not eligible for relief under the statute.

We review de novo a district court’s interpretation of 18 U.S.C. § 3582(c)(2) and the relevant Sentencing Guidelines. See United States v. Main, 579 F.3d 200, 202-03 (2d Cir. 2009).

The government argues that the district court properly denied Jennings’s § 3582(c)(2) motion because he was sentenced to a mandatory minimum sentence of life imprisonment under 21 U.S.C. § 848(b). Jennings objects that he was convicted under 21 U.S.C. § 848(a), a lesser-included offense that requires a minimum sentence of only 20 years’ imprisonment. He argues that the aggravating elements necessary to sustain a § 848(b) conviction were not found by the jury beyond a reasonable doubt. See United States v. Torres, 901 F.2d 205, 240-41 (2d Cir. 1990). We need not decide this issue, however, because Jennings is ineligible for a § 3582(c)(2) sentence reduction on other grounds. The crack-cocaine amendments do not apply to offenses that involve more than 4.5 kg of cocaine base, which is now the highest offense level under U.S.S.G. § 2D1.1. Here, Jennings’s crime of conviction was found to involve 13.6 kg of cocaine base, in addition to 19.0 kg of cocaine and 185.0 kg of marijuana. Because Jennings’s offense involved an amount well above the 4.5 kg threshold, his sentence was not “based on a sentencing range that has subsequently been lowered” by the Sentencing Commission, and so § 3582(c)(2) does not apply to him.

We have considered all of Appellant’s remaining arguments and found them to be without merit. Accordingly, we AFFIRM the judgment of the district court.