diff --git a/web/package.json b/web/package.json
index f5bf784..9b4be98 100644
--- a/web/package.json
+++ b/web/package.json
@@ -16,6 +16,7 @@
   "devDependencies": {
     "@types/react": "^19.0.0",
     "@types/react-dom": "^19.0.0",
+    "@types/three": "^0.172.0",
     "@vitejs/plugin-react": "^4.3.4",
     "typescript": "^5.7.0",
     "vite": "^6.0.0"