diff --git a/js/d3/package.json b/js/d3/package.json
index 2efa5b5..0b0831f 100644
--- a/js/d3/package.json
+++ b/js/d3/package.json
@@ -24,7 +24,7 @@
     "jsdom": "0.2.10"
   },
   "devDependencies": {
-    "uglify-js": "1.2.3",
+    "uglify-js": "3.6.7",
     "vows": "0.6.x"
   },
   "scripts": {