diff --git a/airbyte-integrations/connectors/source-notion/spec.patch.json b/airbyte-integrations/connectors/source-notion/spec.patch.json
index af0c4bb88836..b932114b46a6 100644
--- a/airbyte-integrations/connectors/source-notion/spec.patch.json
+++ b/airbyte-integrations/connectors/source-notion/spec.patch.json
@@ -3,7 +3,7 @@
   "properties": {
     "start_date": {
       "default": "2023-04-17T00:00:00.000Z",
-      "format": null
+      "format": "date-time"
     },
     "credentials": {
       "title": "Authenticate using",