diff --git a/composer.json b/composer.json
index dfada28c99..2ce02eb173 100644
--- a/composer.json
+++ b/composer.json
@@ -96,7 +96,7 @@
     "include-path": ["vendor/zend/gdata/library"],
     "extra":        {
         "branch-alias": {
-            "dev-master": "3.9.x-dev"
+            "dev-master": "4.0.x-dev"
         }
     }
 }
diff --git a/composer.lock b/composer.lock
index e5da51f95d..157d18695e 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file",
         "This file is @generated automatically"
     ],
-    "hash": "871249c945f0d4bb1df2bd374d638f69",
+    "hash": "0c3b693da834a901c191e0c8f77e0c99",
     "packages": [
         {
             "name": "alchemy-fr/tcpdf-clone",