diff --git a/package.json b/package.json
index 5b4bef1..4f6af2f 100644
--- a/package.json
+++ b/package.json
@@ -30,7 +30,7 @@
   "devDependencies": {
     "@types/node": "^8.0.17",
     "mocha": "^3.4.2",
-    "nyc": "^11.0.3",
+    "nyc": "^13.3.0",
     "tslint": "^5.6.0",
     "typescript": "^2.4.2"
   }