diff --git a/package.json b/package.json
index b5602f6..69425de 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "coveralls": "^3.0.3",
     "grunt": "^1.0.1",
     "grunt-browserify": "^5.0.0",
-    "grunt-contrib-uglify": "^4.0.0",
+    "grunt-contrib-uglify": "^5.0.0",
     "grunt-documentation": "^1.2.1",
     "istanbul": "^0.4.5",
     "mocha": "^7.1.1",