diff --git a/web/vercel.json b/web/vercel.json
index 4bf76da6..767d5273 100644
--- a/web/vercel.json
+++ b/web/vercel.json
@@ -9,5 +9,5 @@
       "headers": [{"key": "Cache-Control", "value": "no-cache"}]
     }
   ],
-  "ignoreCommand": "git fetch --depth=2 && git diff HEAD^ HEAD --quiet -- ./ ../common/"
+  "ignoreCommand": "git fetch --unshallow 2>/dev/null || true && git diff $VERCEL_GIT_PREVIOUS_SHA $VERCEL_GIT_COMMIT_SHA --quiet -- ./ ../common/"
 }