diff --git a/.editorconfig b/.editorconfig
index 0253534..f607091 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -3,7 +3,7 @@ root = true
 [*]
 charset = utf-8
 indent_style = tab
-indent_size = 4
+indent_size = 2
 end_of_line = lf
 insert_final_newline = true
 trim_trailing_whitespace = true
diff --git a/.eslintrc.js b/.eslintrc.js
index 0fe1720..b3424df 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -8,6 +8,7 @@ module.exports = {
 		sourceType: 'module'
 	},
 	env: {
+		mocha: true,
 		es6: true,
 		browser: true,
 		node: true,
@@ -38,9 +39,9 @@ module.exports = {
 		'no-console': 0,
 		// 不在 else 中 return
 		'no-else-return': 0,
-        // 用什么来缩进，规定使用tab 来进行缩进，switch中case也需要一个tab .
-        'indent': [2, 'tab', { 'SwitchCase': 1 }],
-        // 对于回调类型函数，不必坚持 return
+		// 用什么来缩进，规定使用tab 来进行缩进，switch中case也需要一个tab .
+		'indent': [2, 'tab', { 'SwitchCase': 1 }],
+		// 对于回调类型函数，不必坚持 return
 		'consistent-return': 0,
 		// 不推荐解构赋值
 		'prefer-destructuring': 0,
diff --git a/.travis.yml b/.travis.yml
index 2a8bd10..7f74758 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,7 +1,7 @@
 language: node_js
 
 node_js:
-  - 8
+  - 12
 
 cache:
   yarn: true
diff --git a/gulpfile.js b/gulpfile.js
index 0188349..cd7c0a5 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -2,7 +2,6 @@ const $fs = require('fs');
 const $path = require('path');
 const $gulp = require('gulp');
 const $gulpMocha = require('gulp-mocha');
-const $runSequence = require('run-sequence');
 
 const $upload = require('./index');
 const $config = require('./test/config');
@@ -50,14 +49,13 @@ $gulp.task(
 		.pipe($gulpMocha())
 );
 
-$gulp.task('test', () => $runSequence(
+$gulp.task('test', $gulp.series(
 	'prepare',
 	'upload',
 	'upload-withBase',
 	'mocha'
 ));
 
-$gulp.task('default', [
+$gulp.task('default', $gulp.series(
 	'test'
-]);
-
+));
diff --git a/index.js b/index.js
index 6e51320..b8d7350 100644
--- a/index.js
+++ b/index.js
@@ -23,12 +23,14 @@ const requestParam = {
 const upload = options => {
 	options = options || {};
 
-	let conf = Object.assign({
+	let conf = {
 		prefix: '',
 		debug: false,
 		log: true,
-		overwrite: false
-	}, requestParam, options);
+		overwrite: false,
+		...requestParam,
+		...options
+	};
 
 	let nTotal = 0;
 	let nSkip = 0;
@@ -74,7 +76,7 @@ const upload = options => {
 
 			nTotal++;
 
-			let spec = Object.assign({}, conf);
+			let spec = { ...conf };
 			spec.FilePath = file.path;
 			spec.Key = uploadPath;
 
@@ -111,4 +113,3 @@ const upload = options => {
 };
 
 module.exports = upload;
-
diff --git a/package.json b/package.json
index 03273a8..1f7d88d 100644
--- a/package.json
+++ b/package.json
@@ -34,36 +34,31 @@
   },
   "homepage": "https://github.com/TabSpace/gulp-qcloud-cos-upload#readme",
   "devDependencies": {
-    "@commitlint/cli": "^7.5.2",
-    "@commitlint/config-conventional": "^7.5.0",
-    "babel-eslint": "8.0.2",
-    "chai": "4.1.2",
-    "commitizen": "^3.0.5",
-    "cz-conventional-changelog": "^2.1.0",
-    "eslint": "4.10.0",
-    "eslint-config-airbnb-base": "12.1.0",
-    "eslint-friendly-formatter": "3.0.0",
-    "eslint-plugin-import": "2.8.0",
-    "gulp": "3.9.1",
-    "gulp-mocha": "4.3.1",
-    "husky": "^1.3.1",
-    "lint-staged": "^8.1.4",
-    "mocha": "4.0.1",
-    "request-promise": "4.2.2",
-    "run-sequence": "2.2.0",
-    "semantic-release": "^15.13.3"
+    "@commitlint/cli": "^9.1.1",
+    "@commitlint/config-conventional": "^9.1.1",
+    "babel-eslint": "^10.1.0",
+    "commitizen": "^4.1.2",
+    "cz-conventional-changelog": "^3.2.0",
+    "eslint": "^7.5.0",
+    "eslint-config-airbnb-base": "^14.2.0",
+    "eslint-friendly-formatter": "^4.0.1",
+    "eslint-plugin-import": "^2.22.0",
+    "gulp": "^4.0.2",
+    "gulp-mocha": "^7.0.2",
+    "husky": "^4.2.5",
+    "lint-staged": "^10.2.11",
+    "mocha": "^8.0.1",
+    "power-assert": "^1.6.1",
+    "request-promise": "^4.2.6",
+    "semantic-release": "^17.1.1"
   },
   "dependencies": {
     "chalk": "^2.4.2",
     "fancy-log": "^1.3.3",
     "plugin-error": "^1.0.1",
-    "qcloud-cos-upload": "^1.2.8",
-    "through2": "2.0.3",
-    "url-join": "2.0.2"
-  },
-  "engines": {
-    "node": ">= 8.0.0",
-    "npm": ">= 5.0.0"
+    "qcloud-cos-upload": "^1.3.1",
+    "through2": "^4.0.2",
+    "url-join": "^4.0.1"
   },
   "husky": {
     "hooks": {
diff --git a/test/test.js b/test/test.js
index 46c8e08..f32f90a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,16 +1,9 @@
 const $fs = require('fs');
 const $path = require('path');
 const $rp = require('request-promise');
-const $chai = require('chai');
-const $mocha = require('mocha');
+const $assert = require('power-assert');
 const $config = require('./config');
 
-const {
-	describe,
-	it,
-	before
-} = $mocha;
-
 const domain = `${$config.Bucket}-${$config.AppId}.coscd.myqcloud.com`;
 const perfix = $config.prefix;
 const base = 'base';
@@ -43,13 +36,13 @@ describe('check-upload', function () {
 	});
 
 	it('File 1 exists', () => {
-		$chai.expect(test1cosRs).to.be.a('string');
-		$chai.expect(test1cosRs).to.include(tsContent);
+		$assert(typeof test1cosRs === 'string');
+		$assert(test1cosRs.indexOf(tsContent) >= 0);
 	});
 
 	it('File 2 exists', () => {
-		$chai.expect(test2cosRs).to.be.a('string');
-		$chai.expect(test2cosRs).to.include(tsContent);
+		$assert(typeof test2cosRs === 'string');
+		$assert(test2cosRs.indexOf(tsContent) >= 0);
 	});
 });
 
@@ -71,7 +64,7 @@ describe('check-uploadBase', function () {
 	});
 
 	it('File 1 exists', () => {
-		$chai.expect(test1cosRs).to.be.a('string');
-		$chai.expect(test1cosRs).to.include(tsContent);
+		$assert(typeof test1cosRs === 'string');
+		$assert(test1cosRs.indexOf(tsContent) >= 0);
 	});
 });