diff --git a/schema/index.yaml b/schema/index.yaml
index dabed25..433bd8d 100644
--- a/schema/index.yaml
+++ b/schema/index.yaml
@@ -103,7 +103,7 @@ $defs:
         type: object
   person:
     type: object
-    additionalProperties: true
+    additionalProperties: false
     required:
       - name
     properties: