diff --git a/install/sql/ispconfig3.sql b/install/sql/ispconfig3.sql
index 9c8f04e26363f627199f6c4c5575a9948847449b..d43f956d35c72fd7f539bf64844a65cd8752f2e6 100644
--- a/install/sql/ispconfig3.sql
+++ b/install/sql/ispconfig3.sql
@@ -2280,7 +2280,7 @@ INSERT INTO `sys_user` (`userid`, `sys_userid`, `sys_groupid`, `sys_perm_user`,
 -- Dumping data for table `sys_config`
 --
 
-INSERT INTO sys_config VALUES ('db','db_version','3.0.5.3');
+INSERT INTO sys_config VALUES ('db','db_version','3.1dev');
 INSERT INTO sys_config VALUES ('interface','session_timeout','0');
 
 SET FOREIGN_KEY_CHECKS = 1;
diff --git a/install/tpl/config.inc.php.master b/install/tpl/config.inc.php.master
index b217603e69b20cd7323a65de465f322f0a55014e..e5fa2c425923d423e6b3a31fe3d38b0a2da8778c 100644
--- a/install/tpl/config.inc.php.master
+++ b/install/tpl/config.inc.php.master
@@ -56,7 +56,7 @@ $revision = str_replace(array('Revision:','$',' '), '', $svn_revision);
 
 //** Application
 define('ISPC_APP_TITLE', 'ISPConfig');
-define('ISPC_APP_VERSION', '3.0.5.3');
+define('ISPC_APP_VERSION', '3.1dev');
 define('DEVSYSTEM', 0);
 
 
diff --git a/interface/lib/config.inc.php b/interface/lib/config.inc.php
index a27ee16c5e2e72cf1280d9e47214dcf24a2916b5..a5915c7ddad2c2156287a575e7d1c0dbd13af222 100644
--- a/interface/lib/config.inc.php
+++ b/interface/lib/config.inc.php
@@ -44,7 +44,7 @@ $revision = str_replace(array('Revision:', '$', ' '), '', $svn_revision);
 
 //** Application
 define('ISPC_APP_TITLE', 'ISPConfig');
-define('ISPC_APP_VERSION', '3.0.5.3');
+define('ISPC_APP_VERSION', '3.1dev');
 define('DEVSYSTEM', 0);
 
 
diff --git a/interface/web/themes/blue/ispconfig_version b/interface/web/themes/blue/ispconfig_version
index 7440a5baf82ac52d9336821294c1ef9bbcb6401a..e46f8184283c4b6cedee1594fb5572757c721475 100644
--- a/interface/web/themes/blue/ispconfig_version
+++ b/interface/web/themes/blue/ispconfig_version
@@ -1 +1 @@
-3.0.5.3
+3.1dev