diff --git a/build.mill.scala b/build.mill.scala
index e6c374d..07a4ea7 100644
--- a/build.mill.scala
+++ b/build.mill.scala
@@ -25,7 +25,7 @@ import mill.util.{Tasks, VcsVersion}
 
 object Versions {
   def scala          = "3.3.7"
-  def scalaCli       = "1.8.5"
+  def scalaCli       = "1.9.1"
   def graalVmVersion = "22.3.1"
   def coursier       = "2.1.25-M19"
   def osLib          = "0.11.6"