diff --git a/package.json b/package.json
index 8858bd9..7895ad3 100644
--- a/package.json
+++ b/package.json
@@ -37,6 +37,6 @@
     "package-preamble": "0.0",
     "rollup": "0.41",
     "tape": "4",
-    "uglify-js": "2"
+    "uglify-js": "^2.8.11"
   }
 }