diff --git a/tap_github/schemas/pull_requests.json b/tap_github/schemas/pull_requests.json
index 91c0c4b..2f7c214 100644
--- a/tap_github/schemas/pull_requests.json
+++ b/tap_github/schemas/pull_requests.json
@@ -92,6 +92,9 @@
         }
       }
     },
+    "merge_commit_sha": {
+      "type": ["null", "string"],
+    },
     "merged_at": {
       "type": ["null", "string"],
       "format": "date-time"