diff --git a/package.json b/package.json
index b40fe2c..bf8e419 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^3.0.0",
     "mocha": "^5.0.0",
-    "nyc": "^12.0.1",
+    "nyc": "^15.1.0",
     "power-assert": "^1.4.4",
     "shx": "^0.3.0",
     "sinon": "^6.0.0",