diff --git a/test/support/express4/package.json b/test/support/express4/package.json
index f1db45c..0bc49fb 100644
--- a/test/support/express4/package.json
+++ b/test/support/express4/package.json
@@ -8,7 +8,7 @@
   "dependencies": {
     "body-parser": "~1.18.3",
     "cookie-parser": "~1.4.3",
-    "debug": "~3.1.0",
+    "debug": "~4.4.1",
     "express": "~4.16.3",
     "morgan": "~1.9.0",
     "pug": "~2.0.3",