diff --git a/package.json b/package.json
index 22da339..05433e1 100644
--- a/package.json
+++ b/package.json
@@ -29,7 +29,7 @@
     "graphicsmagick-stream": "2.0.1",
     "pkgcloud": "0.9.6",
     "mime": "1.2.11",
-    "debug": "2.0.0",
+    "debug": "4.1.1",
     "co": "3.1.0"
   },
   "devDependencies": {