diff --git a/plugin/src/sbt-test/rewarn/simple/build.sbt b/plugin/src/sbt-test/rewarn/simple/build.sbt
index b266f9f..afaf7dd 100644
--- a/plugin/src/sbt-test/rewarn/simple/build.sbt
+++ b/plugin/src/sbt-test/rewarn/simple/build.sbt
@@ -1,6 +1,6 @@
 import sbt.complete.DefaultParsers._
 
-scalaVersion  := "2.12.21"
+scalaVersion  := "2.13.18"
 scalacOptions := Seq("-Xlint:unused")
 
 InputKey[Unit]("contains") := {