diff --git a/package.json b/package.json
index d0ef345..2b1708b 100644
--- a/package.json
+++ b/package.json
@@ -41,7 +41,7 @@
     "rollup": "^0.41.4",
     "rollup-plugin-commonjs": "^8.0.2",
     "sinon": "^2.0.0-pre",
-    "uglify-js": "^3.0.7"
+    "uglify-js": "^3.0.9"
   },
   "peerDependencies": {
     "sinon": "^2.0.0-pre"