diff --git a/CHANGELOG.md b/CHANGELOG.md
index f51927b..86fa60a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 # SwissPayment Changelog
 
-## 0.X.X (2016-XX-XX)
+## 0.4.0 (2016-08-28)
 
   * Added support for general account identifiers.
   * Added support for intermediary transaction agents.
diff --git a/src/Z38/SwissPayment/Message/AbstractMessage.php b/src/Z38/SwissPayment/Message/AbstractMessage.php
index 2b5aa2f..90482b6 100644
--- a/src/Z38/SwissPayment/Message/AbstractMessage.php
+++ b/src/Z38/SwissPayment/Message/AbstractMessage.php
@@ -72,7 +72,7 @@ public function getSoftwareName()
      */
     public function getSoftwareVersion()
     {
-        return 'dev-master';
+        return '0.4.0';
     }
 
     /**