diff --git a/Lake/Version.lean b/Lake/Version.lean
index 5bc0e27b36..c078b0d6dc 100644
--- a/Lake/Version.lean
+++ b/Lake/Version.lean
@@ -6,8 +6,8 @@ Authors: Mac Malone
 
 namespace Lake
 
-def version.major := 3
-def version.minor := 3
+def version.major := 4
+def version.minor := 0
 def version.patch := 0
 
 def version.isPrerelease := true