diff --git a/package.json b/package.json
index 684c156..9801ac2 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "optimized": "node --allow-natives-syntax --trace_opt --trace_deopt test/optimized.js"
   },
   "dependencies": {
-    "debug": "^3.1.0",
+    "debug": "^4.0.0",
     "long": "^4.0.0",
     "utility": "^1.13.1"
   },