Cite as: 511 U. S. 244 (1994)
Opinion of the Court
Changes in procedural rules may often be applied in suits arising before their enactment without raising concerns about retroactivity. For example, in Ex parte Collett, 337 U. S. 55, 71 (1949), we held that 28 U. S. C. § 1404(a) governed the transfer of an action instituted prior to that statute's enactment. We noted the diminished reliance interests in matters of procedure. 337 U. S., at 71.28 Because rules of procedure regulate secondary rather than primary conduct, the fact that a new procedural rule was instituted after the conduct giving rise to the suit does not make application of the rule at trial retroactive. Cf. McBurney v. Carson, 99 U. S. 567, 569 (1879).29
28 While we have strictly construed the Ex Post Facto Clause to prohibit application of new statutes creating or increasing punishments after the fact, we have upheld intervening procedural changes even if application of the new rule operated to a defendant's disadvantage in the particular case. See, e. g., Dobbert v. Florida, 432 U. S. 282, 293-294 (1977); see also Collins v. Youngblood, 497 U. S. 37 (1990); Beazell v. Ohio, 269 U. S. 167 (1925).
29 Of course, the mere fact that a new rule is procedural does not mean that it applies to every pending case. A new rule concerning the filing of complaints would not govern an action in which the complaint had already been properly filed under the old regime, and the promulgation of a new rule of evidence would not require an appellate remand for a new trial. Our orders approving amendments to federal procedural rules reflect the commonsense notion that the applicability of such provisions ordinarily depends on the posture of the particular case. See, e. g., Order Amending Federal Rules of Criminal Procedure, 495 U. S. 969 (1990) (amendments applicable to pending cases "insofar as just and practicable"); Order Amending Federal Rules of Civil Procedure, 456 U. S. 1015 (1982) (same); Order Amending Bankruptcy Rules and Forms, 421 U. S. 1021 (1975) (amendments applicable to pending cases "except to the extent that in the opinion of the court their application in a particular proceeding then pending would not be feasible or would work injustice"). Contrary to Justice Scalia's suggestion, post, at 290, we do not restrict the presumption against statutory retroactivity to cases involving "vested rights." (Neither is Justice Story's definition of retroactivity, quoted supra, at 269, so restricted.) Nor do we suggest that concerns about retroactivity have no application to procedural rules.
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