diff --git a/Lake/Version.lean b/Lake/Version.lean
index 7d62c4aef6..b48157b1b3 100644
--- a/Lake/Version.lean
+++ b/Lake/Version.lean
@@ -7,10 +7,10 @@ Authors: Mac Malone
 namespace Lake
 
 def version.major := 4
-def version.minor := 0
+def version.minor := 1
 def version.patch := 0
 
-def version.isPrerelease := false
+def version.isPrerelease := true
 def version.isRelease := !isPrerelease
 def version.specialDesc := if isPrerelease then "pre" else ""