diff --git a/build.mill.scala b/build.mill.scala
index 9ea20de..38067c6 100644
--- a/build.mill.scala
+++ b/build.mill.scala
@@ -22,7 +22,7 @@ import com.lumidion.sonatype.central.client.core.{PublishingType, SonatypeCreden
 
 object Versions {
   def scala213                = "2.13.18"
-  def scalaJsVersion          = "1.20.2"
+  def scalaJsVersion          = "1.21.0"
   def jsoniterVersion         = "2.38.9"
   def scalaJsImportMapVersion = "0.1.1"
   def graalVmVersion          = "22.3.1"