diff --git a/project/Build.scala b/project/Build.scala
index acc50ef01519..4f515276abfd 100644
--- a/project/Build.scala
+++ b/project/Build.scala
@@ -98,7 +98,7 @@ object Build {
    *
    *  Warning: Change of this variable needs to be consulted with `expectedTastyVersion`
    */
-  val referenceVersion = "3.6.3-RC2"
+  val referenceVersion = "3.6.4-RC1"
 
   /** Version of the Scala compiler targeted in the current release cycle
    *  Contains a version without RC/SNAPSHOT/NIGHTLY specific suffixes