diff --git a/package.json b/package.json
index c3af114..030b5f8 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "url": "http://github.com/jasondavies/science.js.git"
   },
   "devDependencies": {
-    "uglify-js": "2.4.24",
+    "uglify-js": "3.6.1",
     "vows": "0.6.0"
   }
 }