diff --git a/apps/emqttd/src/emqttd.app.src b/apps/emqttd/src/emqttd.app.src
index 3c0bbd24c..5f8afd51a 100644
--- a/apps/emqttd/src/emqttd.app.src
+++ b/apps/emqttd/src/emqttd.app.src
@@ -1,7 +1,7 @@
 {application, emqttd,
  [
   {description, "Erlang MQTT Broker"},
-  {vsn, "0.5.4"},
+  {vsn, "0.5.5"},
   {modules, []},
   {registered, []},
   {applications, [kernel,