diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 3d86038b0aa410ab14c77d9fc7afa213f07fc090..ee31c1153cc0f9ce870c135e8df017b3b1f6d5d6 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -1,5 +1,8 @@
 // $Id$
 
+Drupal 5.20-dev xxxx-xx-xx
+-----------------------
+
 Drupal 5.19, 2009-07-01
 -----------------------
 - Fixed security issues (Cross site scripting and Password leakage in URL), see
diff --git a/modules/system/system.module b/modules/system/system.module
index e2e96e1527b15667e84473adff9b939e52a111e9..4da70448deddddb832e0dc2eb647589f84d03417 100644
--- a/modules/system/system.module
+++ b/modules/system/system.module
@@ -6,7 +6,7 @@
  * Configuration system that lets administrators modify the workings of the site.
  */
 
-define('VERSION', '5.19');
+define('VERSION', '5.20-dev');
 
 /**
  * Implementation of hook_help().