diff --git a/package.json b/package.json
index 70ae397..b6e29cf 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "body-parser": "^1.18.3",
     "cross-env": "^5.2.0",
     "express": "^4.16.4",
+    "nyc": "^15.1.0",
     "puppeteer": "^5.3.1",
     "puppeteer-to-istanbul": "^1.4.0",
     "qcloud-cos-sts": "^3.0.2",