diff --git a/CHANGELOG.md b/CHANGELOG.md
index 22b06da..0c32754 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,9 @@
 # SwissPayment Changelog
 
-## 0.X.X (2017-XX-XX)
+## 0.5.0 (2017-03-07)
 
   * Added support for transaction purposes.
+  * Improved validation of postal account numbers.
 
 ## 0.4.1 (2016-08-31)
 
diff --git a/src/Z38/SwissPayment/Message/AbstractMessage.php b/src/Z38/SwissPayment/Message/AbstractMessage.php
index f43a0d8..88e278f 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 '0.4.1';
+        return '0.5.0';
     }
 
     /**