diff --git a/package.json b/package.json
index 0bf67bd..54a2e53 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "grunt-contrib-concat": "1.0.1",
     "grunt-replace": "2.0.2",
     "gruntify-eslint": "5.0.0",
-    "istanbul-lib-instrument": "4.0.3",
+    "istanbul-lib-instrument": "5.1.0",
     "jsdom": "9.12.0",
     "mocha": "8.4.0",
     "nyc": "15.1.0",