diff --git a/package-lock.json b/package-lock.json
index 3288ea1..418a0f3 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -121,11 +121,18 @@
       }
     },
     "debug": {
-      "version": "3.1.0",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-3.1.0.tgz",
-      "integrity": "sha512-OX8XqP7/1a9cqkxYw2yXss15f26NKWBpDXQd0/uK/KPqdQhxbPa994hnzjcE2VqQpDslf55723cKPUOGSmMY3g==",
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+      "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
       "requires": {
-        "ms": "2.0.0"
+        "ms": "^2.1.1"
+      },
+      "dependencies": {
+        "ms": {
+          "version": "2.1.3",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
+          "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="
+        }
       }
     },
     "denque": {
diff --git a/package.json b/package.json
index 0166686..83329a9 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
     "test": "mocha --reporter spec --slow 200 --timeout 5000 --bail"
   },
   "dependencies": {
-    "debug": "~3.1.0",
+    "debug": "~4.1.0",
     "notepack.io": "~2.1.0",
     "redis": "2.6.3",
     "socket.io-parser": "3.1.2"