diff --git a/CHANGELOG b/CHANGELOG
index 25db7dfa3f..94b2f067a7 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,10 @@
+Version 2023.09 (unreleased)
+  Friendica Core
+
+  Friendica Addons
+
+  Closed Issues
+
 Version 2023.05 (2023-05-23)
   Friendica Core
     Updates to the translations HU, PL
diff --git a/VERSION b/VERSION
index e4a82cd8ec..c32d7efee0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2023.05
+2023.09-dev
diff --git a/database.sql b/database.sql
index 6377222b0b..4e674d63f4 100644
--- a/database.sql
+++ b/database.sql
@@ -1,5 +1,5 @@
 -- ------------------------------------------
--- Friendica 2023.05 (Giant Rhubarb)
+-- Friendica 2023.09-dev (Giant Rhubarb)
 -- DB_UPDATE_VERSION 1518
 -- ------------------------------------------
 
diff --git a/src/App.php b/src/App.php
index e47054f55b..249c9f66ac 100644
--- a/src/App.php
+++ b/src/App.php
@@ -64,7 +64,7 @@ class App
 {
 	const PLATFORM = 'Friendica';
 	const CODENAME = 'Giant Rhubarb';
-	const VERSION  = '2023.05';
+	const VERSION  = '2023.09-dev';
 
 	// Allow themes to control internal parameters
 	// by changing App values in theme.php