diff --git a/libs/langgraph-ui/package.json b/libs/langgraph-ui/package.json
index e9d4710..41af05e 100644
--- a/libs/langgraph-ui/package.json
+++ b/libs/langgraph-ui/package.json
@@ -35,6 +35,7 @@
     "@types/node": "^22.2.0",
     "@types/react-dom": "^19.0.3",
     "prettier": "^3.3.3",
-    "vitest": "^3.0.5"
+    "vitest": "^3.0.5",
+    "typescript": "^5.5.4"
   }
 }