diff --git a/composer.json b/composer.json
index 7ca64f0ba..060b41d9d 100644
--- a/composer.json
+++ b/composer.json
@@ -65,7 +65,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-main": "2.7-dev"
+            "dev-main": "2.8-dev"
         },
         "phpstan": {
             "includes": [
diff --git a/src/Composer/Composer.php b/src/Composer/Composer.php
index 4bf1679f6..07d697333 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 = '2.7.999-dev+source';
+    public const SOURCE_VERSION = '2.8.999-dev+source';
 
     /**
      * Version number of the internal composer-runtime-api package