diff --git a/package-lock.json b/package-lock.json
index 9f90ab9..f0a254a 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,11 +5,11 @@
   "requires": true,
   "dependencies": {
     "debug": {
-      "version": "2.6.9",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.0.tgz",
+      "integrity": "sha512-heNPJUJIqC+xB6ayLAMHaIrmN9HKa7aQO8MGqKpvCA+uJYVcvR6l5kgdrhRuwPFHU7P5/A1w0BjByPHwpfTDKg==",
       "requires": {
-        "ms": "2.0.0"
+        "ms": "^2.1.1"
       }
     },
     "dur": {
@@ -18,9 +18,9 @@
       "integrity": "sha1-a9kU51DVcHgUQYW2mz0Gkmggw+M="
     },
     "ms": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
-      "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g="
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+      "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
     },
     "quu": {
       "version": "0.3.0",
diff --git a/package.json b/package.json
index ba78745..bcae61f 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "url": "https://github.com/yetzt/nsa.git"
   },
   "dependencies": {
-    "debug": "^2.2.0",
+    "debug": "^4.0.0",
     "dur": "^0.0.2",
     "quu": "^0.3.0"
   },