diff --git a/src/rabbitmq_email.app.src b/src/rabbitmq_email.app.src
index 61f6561..f36deb9 100644
--- a/src/rabbitmq_email.app.src
+++ b/src/rabbitmq_email.app.src
@@ -9,7 +9,7 @@
 
 {application, rabbitmq_email,
     [{description, " E-mail gateway for AMQP 0-9-1"},
-    {vsn, "0.3.0"},
+    {vsn, "0.4.0"},
     {modules, []},
     {registered, []},
     {mod, {rabbitmq_email_app, []}},