diff --git a/typo3/sysext/core/Classes/Core/SystemEnvironmentBuilder.php b/typo3/sysext/core/Classes/Core/SystemEnvironmentBuilder.php
index 08a00961a3684bf5728380d5acb70e58d1e204df..316e040059835cae69446721119b99fcfa45d2bf 100644
--- a/typo3/sysext/core/Classes/Core/SystemEnvironmentBuilder.php
+++ b/typo3/sysext/core/Classes/Core/SystemEnvironmentBuilder.php
@@ -83,7 +83,7 @@ class SystemEnvironmentBuilder {
 	 */
 	static protected function defineBaseConstants() {
 		// This version, branch and copyright
-		define('TYPO3_version', '7.5.0');
+		define('TYPO3_version', '7.5.1-dev');
 		define('TYPO3_branch', '7.5');
 		define('TYPO3_copyright_year', '1998-2015');