diff --git a/package.json b/package.json
index c2e26bb..f1472b5 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "@types/power-assert": "^1.4.29",
     "cross-env": "^5.1.3",
     "mocha": "^5.0.0",
-    "nyc": "^11.4.1",
+    "nyc": "^15.0.0",
     "power-assert": "^1.4.4",
     "shx": "^0.2.2",
     "tslint": "^5.9.1",