diff --git a/build.sc b/build.sc
index e29f82e..82bb983 100644
--- a/build.sc
+++ b/build.sc
@@ -20,7 +20,7 @@ lazy val rtMillVersion = build.version()
 sealed trait CrossConfig {
   def millPlatform: String
   def minMillVersion: String
-  def scalaVersion: String = "2.13.16"
+  def scalaVersion: String = "2.13.18"
   def testWithMill: Seq[String] = Seq(minMillVersion)
   def osLibVersion: String
 }
diff --git a/itest/src/scala-steward-mill-plugin/build.sc b/itest/src/scala-steward-mill-plugin/build.sc
index d6baa71..735305f 100644
--- a/itest/src/scala-steward-mill-plugin/build.sc
+++ b/itest/src/scala-steward-mill-plugin/build.sc
@@ -17,7 +17,7 @@ import de.tobiasroeser.mill.integrationtest._
 trait PlatformConfig {
   def millVersion: String
   def millPlatform: String
-  def scalaVersion: String = "2.13.16"
+  def scalaVersion: String = "2.13.18"
   def testWith: Seq[String]
 
   def millScalalib = ivy"com.lihaoyi::mill-scalalib:${millVersion}"