diff --git a/package.json b/package.json
index c9665fc..666b79c 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
     "babel-preset-env": "^1.7.0",
     "rollup": "^0.65.0",
     "rollup-plugin-babel": "^3.0.7",
-    "rollup-plugin-uglify": "^2.0.1",
+    "rollup-plugin-uglify": "^5.0.0",
     "semistandard": "^12.0.1"
   }
 }