diff --git a/package.json b/package.json
index 16b2516..0d99d23 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "async.util.ensureasync": "0.5.0",
     "async.util.isarray": "0.5.0",
     "async.util.noop": "0.5.0",
-    "async.util.once": "0.5.0",
+    "async.util.once": "0.5.1",
     "async.util.restparam": "0.5.0"
   },
   "keywords": [