diff --git a/build.sbt b/build.sbt
index 5d00c2c2..0b1a770a 100644
--- a/build.sbt
+++ b/build.sbt
@@ -56,7 +56,7 @@ scalacOptions := Seq(
   "-explaintypes",
   "-feature",
   "-language:postfixOps",
-  "-Xtarget:17",
+  "-Xtarget:21",
   "-Wunused:all"
   /* "-Wunused:nowarn" */