diff --git a/doc.go b/doc.go
index de16f5d9..c7750158 100644
--- a/doc.go
+++ b/doc.go
@@ -11,4 +11,4 @@ package mail
 
 // VERSION indicates the current version of the package. It is also attached to the default user
 // agent string.
-const VERSION = "0.4.4"
+const VERSION = "0.5.0"