diff --git a/assets/schema.json b/assets/schema.json
index 8021012..4bd1df6 100644
--- a/assets/schema.json
+++ b/assets/schema.json
@@ -20,6 +20,7 @@
             "type": "string"
           }
         },
+        "additionalProperties": false,
         "required": [
           "id",
           "createdAt",
@@ -55,6 +56,7 @@
             "type": "string"
           }
         },
+        "additionalProperties": false,
         "required": [
           "id",
           "createdAt",
@@ -90,6 +92,7 @@
             }
           }
         },
+        "additionalProperties": false,
         "required": [
           "id",
           "name",
@@ -120,6 +123,7 @@
             }
           }
         },
+        "additionalProperties": false,
         "required": [
           "id",
           "name",
@@ -161,6 +165,7 @@
             "type": "string"
           }
         },
+        "additionalProperties": false,
         "required": [
           "id",
           "name",
@@ -172,6 +177,7 @@
       }
     }
   },
+  "additionalProperties": false,
   "required": [
     "players",
     "games",