diff --git a/build.sbt b/build.sbt
index d612ac7f..7d0d401e 100644
--- a/build.sbt
+++ b/build.sbt
@@ -6,7 +6,7 @@ lazy val commonSettings = Seq(
   crossScalaVersions := Seq("2.13.12")
 )
 
-val chiselVersion = "6.0.0"
+val chiselVersion = "6.4.0"
 val firrtlVersion = "6.0-SNAPSHOT"
 
 lazy val chiseltestSettings = Seq(