diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index 2133283..ebc2cad 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -13,7 +13,9 @@ jobs:
     with:
       os: 'ubuntu-latest'
       version: '8, 10, 12, 14, 16, 18, 20, 22'
-  
+    secrets:
+      CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
   build-with-zig:
     strategy:
       fail-fast: false
diff --git a/lib/object.js b/lib/object.js
index f3e8048..f534643 100644
--- a/lib/object.js
+++ b/lib/object.js
@@ -11,7 +11,6 @@
 'use strict';
 
 var util = require('util');
-var has = require('utility').has;
 
 exports.DEFAULT_CLASSNAME = {
   boolean: 'boolean',
@@ -167,6 +166,10 @@ function JavaExceptionError(obj, withType) {
 
 util.inherits(JavaExceptionError, Error);
 
+function has(obj, prop) {
+  return Object.prototype.hasOwnProperty.call(obj, prop);
+}
+
 exports.isJavaException = function (obj) {
   if (has(obj, 'detailMessage') && has(obj, 'stackTrace')) {
     return true;
diff --git a/lib/utils.js b/lib/utils.js
index 67d0218..7607070 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -9,7 +9,7 @@
 
 'use strict';
 
-var debug = require('debug')('hessian.js:utils');
+var debug = require('util').debuglog('hessian.js:utils');
 var object = require('./object');
 
 var MAX_INT_8 = exports.MAX_INT_8 = Math.pow(2, 7);
diff --git a/lib/v1/decoder.js b/lib/v1/decoder.js
index b1e929b..3528418 100644
--- a/lib/v1/decoder.js
+++ b/lib/v1/decoder.js
@@ -10,7 +10,7 @@
 
 'use strict';
 
-var debug = require('debug')('hessian:v1:decoder');
+var debug = require('util').debuglog('hessian:v1:decoder');
 var ByteBuffer = require('byte');
 var is = require('is-type-of');
 var utils = require('../utils');
diff --git a/lib/v1/encoder.js b/lib/v1/encoder.js
index c6c3ac7..ad7edd3 100644
--- a/lib/v1/encoder.js
+++ b/lib/v1/encoder.js
@@ -11,7 +11,7 @@
 'use strict';
 
 var ByteBuffer = require('byte');
-var debug = require('debug')('hessian:v1:encoder');
+var debug = require('util').debuglog('hessian:v1:encoder');
 var utils = require('../utils');
 var javaObject = require('../object');
 var is = require('is-type-of');
diff --git a/lib/v2/decoder.js b/lib/v2/decoder.js
index 3706c46..d9cd357 100644
--- a/lib/v2/decoder.js
+++ b/lib/v2/decoder.js
@@ -16,7 +16,7 @@
 
 var util = require('util');
 var is = require('is-type-of');
-var debug = require('debug')('hessian:v2:decoder');
+var debug = require('util').debuglog('hessian:v2:decoder');
 var DecoderV1 = require('../v1/decoder');
 var utils = require('../utils');
 var isJavaException = require('../object').isJavaException;
diff --git a/lib/v2/encoder.js b/lib/v2/encoder.js
index 9a1bdab..1e6ceaf 100644
--- a/lib/v2/encoder.js
+++ b/lib/v2/encoder.js
@@ -1,11 +1,8 @@
 'use strict';
 
-var debug = require('debug')('hessian:v2:encoder');
-var is = require('is-type-of');
+var debug = require('util').debuglog('hessian:v2:encoder');
 var util = require('util');
 var EncoderV1 = require('../v1/encoder');
-var javaObject = require('../object');
-var utility = require('utility');
 var Long = require('long');
 var float32Test = require('../utils').float32Test;
 
@@ -82,6 +79,31 @@ proto.writeInt = function (val) {
   return this;
 };
 
+// fork from https://github.com/node-modules/utility/blob/master/src/number.ts#L13
+// http://www.2ality.com/2013/10/safe-integers.html
+// http://es6.ruanyifeng.com/#docs/number
+const MAX_SAFE_INTEGER = Number.MAX_SAFE_INTEGER || Math.pow(2, 53) - 1;
+// const MIN_SAFE_INTEGER = -MAX_SAFE_INTEGER;
+const MAX_SAFE_INTEGER_STR = String(MAX_SAFE_INTEGER);
+const MAX_SAFE_INTEGER_STR_LENGTH = MAX_SAFE_INTEGER_STR.length;
+
+/**
+ * Detect a number string can safe convert to Javascript Number.
+ *
+ * @param {String} s number format string, like `"123"`, `"-1000123123123123123123"`
+ * @return {Boolean}
+ */
+function isSafeNumberString(s) {
+  if (s[0] === '-') {
+    s = s.substring(1);
+  }
+  if (s.length < MAX_SAFE_INTEGER_STR_LENGTH ||
+    (s.length === MAX_SAFE_INTEGER_STR_LENGTH && s <= MAX_SAFE_INTEGER_STR)) {
+    return true;
+  }
+  return false;
+}
+
 /**
  * encode long
  *
@@ -129,7 +151,7 @@ proto.writeInt = function (val) {
  */
 proto.writeLong = function (val) {
   if (typeof val === 'string') {
-    if (!utility.isSafeNumberString(val)) {
+    if (!isSafeNumberString(val)) {
       val = Long.fromString(val);
     } else {
       val = Number(val);
diff --git a/package.json b/package.json
index 547836a..8183839 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
   "scripts": {
     "lint": "make jshint",
     "test": "make test",
-    "ci": "npm run lint && npm run test",
+    "ci": "npm run lint && make cov",
     "build::platform": "napi build --cargo-cwd ./lib/v2rust --platform --release ./lib/v2rust/harness/dist"
   },
   "repository": {
@@ -33,11 +33,9 @@
   "homepage": "https://github.com/node-modules/hessian.js",
   "dependencies": {
     "@protobufjs/codegen": "^2.0.4",
-    "byte": "^1.4.1",
-    "debug": "^3.2.6",
+    "byte": "^2.0.0",
     "is-type-of": "^1.2.1",
-    "long": "^4.0.0",
-    "utility": "^1.15.0"
+    "long": "^4.0.0"
   },
   "devDependencies": {
     "beautify-benchmark": "^0.2.4",