diff --git a/package.json b/package.json
index 1d8a6913..5eecc421 100644
--- a/package.json
+++ b/package.json
@@ -28,6 +28,7 @@
   },
   "devDependencies": {
     "async": "0.9.0",
+    "co": "4.6.0",
     "jshint": "2.5.2",
     "pg-copy-streams": "0.3.0"
   },