diff --git a/doc.go b/doc.go
index 9afe237..f38b857 100644
--- a/doc.go
+++ b/doc.go
@@ -6,4 +6,4 @@
 package mail
 
 // VERSION is used in the default user agent string
-const VERSION = "0.4.0"
+const VERSION = "0.4.1"