diff --git a/build/build.xml b/build/build.xml
index 9f122b8b4d..1022565ff0 100644
--- a/build/build.xml
+++ b/build/build.xml
@@ -2,7 +2,7 @@
 
 <project name="phpBB" description="The phpBB forum software" default="all" basedir="../">
 	<!-- a few settings for the build -->
-	<property name="newversion" value="3.1.0-a3" />
+	<property name="newversion" value="3.1.0-a4-dev" />
 	<property name="prevversion" value="3.1.0-a2" />
 	<property name="olderversions" value="3.0.12, 3.1.0-a1" />
 	<!-- no configuration should be needed beyond this point -->
diff --git a/phpBB/includes/constants.php b/phpBB/includes/constants.php
index 883fcd3eb6..374b8ff7f7 100644
--- a/phpBB/includes/constants.php
+++ b/phpBB/includes/constants.php
@@ -24,7 +24,7 @@ if (!defined('IN_PHPBB'))
 */
 
 // phpBB Version
-define('PHPBB_VERSION', '3.1.0-a3');
+define('PHPBB_VERSION', '3.1.0-a4-dev');
 
 // QA-related
 // define('PHPBB_QA', 1);
diff --git a/phpBB/install/schemas/schema_data.sql b/phpBB/install/schemas/schema_data.sql
index 9354e5746c..9f198595e0 100644
--- a/phpBB/install/schemas/schema_data.sql
+++ b/phpBB/install/schemas/schema_data.sql
@@ -269,7 +269,7 @@ INSERT INTO phpbb_config (config_name, config_value) VALUES ('tpl_allow_php', '0
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('upload_icons_path', 'images/upload_icons');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('upload_path', 'files');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('use_system_cron', '0');
-INSERT INTO phpbb_config (config_name, config_value) VALUES ('version', '3.1.0-a3');
+INSERT INTO phpbb_config (config_name, config_value) VALUES ('version', '3.1.0-a4-dev');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('warnings_expire_days', '90');
 INSERT INTO phpbb_config (config_name, config_value) VALUES ('warnings_gc', '14400');