diff --git a/package.json b/package.json
index ba8aca5..d204970 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,6 @@
   "homepage": "https://github.com/nodejs/llparse#readme",
   "devDependencies": {
     "@stylistic/eslint-plugin": "^2.6.1",
-    "@types/debug": "^4.1.5",
     "@types/mocha": "^8.0.3",
     "@types/node": "^20.11.16",
     "@typescript-eslint/eslint-plugin": "^8.0.0",
@@ -46,7 +45,6 @@
     "typescript": "^5.0.3"
   },
   "dependencies": {
-    "debug": "^4.2.0",
     "llparse-frontend": "^3.0.0"
   }
 }
diff --git a/src/compiler/index.ts b/src/compiler/index.ts
index 80eb584..58cad08 100644
--- a/src/compiler/index.ts
+++ b/src/compiler/index.ts
@@ -1,4 +1,4 @@
-import * as debugAPI from 'debug';
+import { debuglog } from 'node:util';
 import * as frontend from 'llparse-frontend';
 
 import source = frontend.source;
@@ -6,7 +6,7 @@ import source = frontend.source;
 import * as cImpl from '../implementation/c';
 import { HeaderBuilder } from './header-builder';
 
-const debug = debugAPI('llparse:compiler');
+const debug = debuglog('llparse:compiler');
 
 export interface ICompilerOptions {
   /**