diff --git a/composer.json b/composer.json
index 769642299..625452ba4 100644
--- a/composer.json
+++ b/composer.json
@@ -62,7 +62,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-main": "2.3-dev"
+            "dev-main": "2.4-dev"
         }
     },
     "autoload": {
diff --git a/src/Composer/Composer.php b/src/Composer/Composer.php
index 93e8c0a6f..e07bac101 100644
--- a/src/Composer/Composer.php
+++ b/src/Composer/Composer.php
@@ -54,7 +54,7 @@ class Composer extends PartialComposer
     public const VERSION = '@package_version@';
     public const BRANCH_ALIAS_VERSION = '@package_branch_alias_version@';
     public const RELEASE_DATE = '@release_date@';
-    public const SOURCE_VERSION = '2.3.999-dev+source';
+    public const SOURCE_VERSION = '2.4.999-dev+source';
 
     /**
      * Version number of the internal composer-runtime-api package