Petitioner seeks leave to file a second or successive habeas corpus petition under 28 U.S.C. § 2255. As the ground for the present petition, petitioner relies on the recent United States Supreme Court decision in Blakely v. Washington, — U.S. -, 124 S.Ct. 2531, 159 L.Ed.2d 403 (2004).

Under the relevant gatekeeping provision, a new rule of law can form the basis for a second or successive habeas petition only if that rule is “made retroactive to cases on collateral review by the Supreme Court.” 28 U.S.C. § 2255, para. 8(2). To date, the Supreme Court has not decided whether Blakely is even applicable to the federal sentencing guidelines, see Blakely, 124 S.Ct. at 2538 n. 9 (“The Federal Guidelines are not before us, and we express no *368 opinion on them.”), much less declared its ruling in Blakely to be retroactive to cases on collateral review. Therefore, petitioner may not rely on Blakely as a ground for filing a second or successive petition to vacate his federal sentence. See Simpson v. United States, 376 F.3d 679, 681-82 (7th Cir. 2004); In re Dean, 375 F.3d 1287, 1290 (11 th Cir. 2004); see generally Tyler v. Cain, 533 U.S. 656, 663, 121 S.Ct. 2478, 150 L.Ed.2d 632 (2001) (explaining that “a new rule is not ‘made retroactive to cases on collateral review1 unless the Supreme Court holds it to be retroactive”).

Of course, if the Supreme Court in the future makes Blakely retroactive, the petitioner may at that time attempt to assert a claim by means of a second or successive § 2255 petition. See, e.g., Sustache-Rivera v. United States, 221 F.3d 8, 16-17 (1st Cir. 2000). Until that time, however, the instant application must be considered premature. See id. at 15 n. 12. •

The application is denied without prejudice.