diff --git a/ext/bg/data/dictionary-index-schema.json b/ext/bg/data/dictionary-index-schema.json
index fa1a696b..9311f14c 100644
--- a/ext/bg/data/dictionary-index-schema.json
+++ b/ext/bg/data/dictionary-index-schema.json
@@ -22,11 +22,13 @@
         },
         "format": {
             "type": "integer",
-            "description": "Format of data found in the JSON data files."
+            "description": "Format of data found in the JSON data files.",
+            "enum": [1, 2, 3]
         },
         "version": {
             "type": "integer",
-            "description": "Alias for format."
+            "description": "Alias for format.",
+            "enum": [1, 2, 3]
         },
         "tagMeta": {
             "type": "object",