diff --git a/build.sbt b/build.sbt
index 2cb6242..0714394 100644
--- a/build.sbt
+++ b/build.sbt
@@ -18,7 +18,7 @@ ThisBuild / tlSonatypeUseLegacyHost := false
 ThisBuild / tlSitePublishBranch := Some("main")
 
 val Scala213 = "2.13.16"
-ThisBuild / crossScalaVersions := Seq(Scala213, "3.3.3")
+ThisBuild / crossScalaVersions := Seq(Scala213, "3.3.6")
 ThisBuild / scalaVersion := Scala213 // the default Scala
 
 lazy val root = tlCrossRootProject.aggregate(core, mtl, testkit)