diff --git a/update.json.schema b/update.json.schema
index c1dbd11..821c4a0 100644
--- a/update.json.schema
+++ b/update.json.schema
@@ -18,7 +18,8 @@
     "additionalProperties": false,
     "required": [
         "dev",
-        "stable"
+        "stable",
+        "stable-preview"
     ],
     "definitions": {
         "info": {