--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "webpack-prod": "NODE_ENV=production webpack --config config/webpack.config.js"
   },
   "dependencies": {
-    "npm": "^5.6.0",
+    "yarn": "^1.5.1",
     "autosize": "^4.0.0",
     "axios": "^0.17.1",
     "blackst0ne-mermaid": "^7.1.0-fixed",