diff --git a/package.json b/package.json
index 0c322d8..e9f829b 100644
--- a/package.json
+++ b/package.json
@@ -26,7 +26,7 @@
   "license": "MIT",
   "dependencies": {
     "babel-polyfill": "^6.26.0",
-    "debug": "^3.1.0",
+    "debug": "^4.0.0",
     "fs-cp": "^1.4.0",
     "jstransformer-uglify-js": "^1.2.0",
     "koa": "^2.5.0",