diff --git a/build.sbt b/build.sbt
index ab44537..493c612 100644
--- a/build.sbt
+++ b/build.sbt
@@ -2,7 +2,7 @@ import Dependencies._
 import microsites.ExtraMdFileConfig
 
 ThisBuild / organizationName := "ProfunKtor"
-ThisBuild / crossScalaVersions := List("2.12.21", "2.13.18", "3.3.8")
+ThisBuild / crossScalaVersions := List("2.12.21", "3.9.0", "3.3.8")
 
 // publishing
 ThisBuild / name := """http4s-jwt-auth"""