diff --git a/package.json b/package.json
index 40aea95..d482dd4 100644
--- a/package.json
+++ b/package.json
@@ -13,7 +13,7 @@
     "eslint": "^5.0.0",
     "got": "^9.0.0",
     "mocha": "^5.2.0",
-    "nyc": "^12.0.2",
+    "nyc": "^13.2.0",
     "sinon": "^6.0.1"
   },
   "homepage": "https://github.com/gucong3000/postcss-pie#readme",