diff --git a/package.json b/package.json
index d6ad5ea..7bf43fe 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "coveralls": "~2.11.8",
     "mocha": "~3.2.0",
     "must": "~0.13.1",
-    "nyc": "~6.4.0"
+    "nyc": "~9.0.1"
   },
   "directories": {
     "test": "test"