diff --git a/symfony/mercure-notifier/5.3/manifest.json b/symfony/mercure-notifier/5.3/manifest.json
new file mode 100644
index 00000000..c3d994ef
--- /dev/null
+++ b/symfony/mercure-notifier/5.3/manifest.json
@@ -0,0 +1,5 @@
+{
+    "env": {
+        "#1": "MERCURE_DSN=mercure://mercure.hub.default.publisher"
+    }
+}