diff --git a/code/build.sbt b/code/build.sbt
index 622d52e..d038c27 100644
--- a/code/build.sbt
+++ b/code/build.sbt
@@ -16,7 +16,7 @@ homepage := Some(url("https://github.com/mkurz/deadbolt-2-java")) // Some(url("h
 licenses += ("Apache-2.0", url("https://www.apache.org/licenses/LICENSE-2.0.html"))
 organization := "be.objectify"
 
-crossScalaVersions := Seq("2.13.18", "3.3.8")
+crossScalaVersions := Seq("2.13.18", "3.9.0")
 
 scalaVersion := crossScalaVersions.value.head
 
diff --git a/test-app-filters/build.sbt b/test-app-filters/build.sbt
index 34c0724..e5e7b7b 100644
--- a/test-app-filters/build.sbt
+++ b/test-app-filters/build.sbt
@@ -1,6 +1,6 @@
 name := """test-app-filters"""
 
-crossScalaVersions := Seq("2.13.18", "3.3.8")
+crossScalaVersions := Seq("2.13.18", "3.9.0")
 
 scalaVersion := crossScalaVersions.value.head
 
diff --git a/test-app/build.sbt b/test-app/build.sbt
index abac8c7..8ad64d0 100644
--- a/test-app/build.sbt
+++ b/test-app/build.sbt
@@ -1,6 +1,6 @@
 name := """test-app"""
 
-crossScalaVersions := Seq("2.13.18", "3.3.8")
+crossScalaVersions := Seq("2.13.18", "3.9.0")
 
 scalaVersion := crossScalaVersions.value.head