diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
index ca2c9d6..4fe4e6a 100644
--- a/.github/workflows/nodejs.yml
+++ b/.github/workflows/nodejs.yml
@@ -15,7 +15,7 @@ jobs:
     uses: artusjs/github-actions/.github/workflows/node-test.yml@v1
     with:
       os: 'ubuntu-latest, macos-latest, windows-latest'
-      version: '14.18.0, 14, 16, 18'
+      version: '14.18.0, 14, 16, 18, 20'
       # npm install npm will be fail on Windows with Node.js 14.x, use npminstall instead
       # see https://github.com/npm/cli/issues/4438
       install: 'npm i -g npminstall && npminstall'
diff --git a/bin/cnpm b/bin/cnpm
index 46db5c2..3dbd442 100755
--- a/bin/cnpm
+++ b/bin/cnpm
@@ -11,7 +11,6 @@ const extendsMethd = {
   doc: 1,
   sync: 1,
   user: 1,
-  update: 1,
 };
 
 debug('cnpm %s', action);
diff --git a/bin/cnpm-update b/bin/cnpm-update
deleted file mode 100755
index 35106bc..0000000
--- a/bin/cnpm-update
+++ /dev/null
@@ -1,24 +0,0 @@
-#!/usr/bin/env node
-
-const debug = require('node:util').debuglog('cnpm:update');
-const path = require('node:path');
-const { fork } = require('node:child_process');
-const { rmSync } = require('node:fs');
-
-const cwd = process.cwd();
-const cnpmCli = path.join(__dirname, 'cnpm');
-const options = {
-  stdio: 'inherit',
-};
-
-const nodeModulesDir = path.join(cwd, 'node_modules');
-console.log('[cnpm:update] Removing %s', nodeModulesDir);
-rmSync(nodeModulesDir, { force: true, recursive: true });
-
-console.log('[cnpm:update] Running "cnpm install" on %s', cwd);
-fork(cnpmCli, [ 'install' ], options)
-  .on('exit', code => {
-    debug('exit %s', code);
-    process.exit(code);
-  });
-
diff --git a/lib/origin_npm.js b/lib/origin_npm.js
index 836c896..7df81b6 100644
--- a/lib/origin_npm.js
+++ b/lib/origin_npm.js
@@ -11,6 +11,7 @@ const program = parseArgv();
 const rawArgs = program.rawArgs.slice(2);
 const args = [];
 let isInstall = false;
+let isUpdate = false;
 let installer = 'npminstall';
 
 for (let i = 0; i < rawArgs.length; i++) {
@@ -22,6 +23,10 @@ for (let i = 0; i < rawArgs.length; i++) {
     isInstall = true;
     continue;
   }
+  if (i === 0 && (arg === 'update')) {
+    isUpdate = true;
+    continue;
+  }
 
   // support `$ cnpm i --by=npm`
   if (arg.indexOf('--by=') === 0) {
@@ -77,6 +82,12 @@ if (isInstall) {
   if (!fs.existsSync(npmBin)) {
     npmBin = installer;
   }
+} else if (isUpdate) {
+  execMethod = cp.fork;
+  stdio.push('ipc');
+  npmBin = require.resolve('npminstall/bin/update.js');
+  args.unshift('--china');
+  args.unshift('--fix-bug-versions');
 } else {
   npmBin = path.join(__dirname, '..', 'node_modules', '.bin', 'npm');
 }
diff --git a/test/cnpm-update.test.js b/test/cnpm-update.test.js
index bb8e095..8d02cf1 100644
--- a/test/cnpm-update.test.js
+++ b/test/cnpm-update.test.js
@@ -13,18 +13,20 @@ describe('test/cnpm-update.test.js', () => {
       cwd: root,
     })
       .debug()
-      .expect('stdout', /\[cnpm:update] Removing/)
-      .expect('stdout', /\[cnpm:update] Running "cnpm install" on /)
+      .expect('stdout', /\[npmupdate] removing/)
+      .expect('stdout', /\[npmupdate] reinstall on /)
       .expect('code', 0)
       .end();
     await coffee.fork(cnpm, [
       'update',
+      '--offline',
     ], {
       cwd: root,
     })
       .debug()
-      .expect('stdout', /\[cnpm:update] Removing/)
-      .expect('stdout', /\[cnpm:update] Running "cnpm install" on /)
+      .expect('stderr', /npminstall WARN running on offline mode/)
+      .expect('stdout', /\[npmupdate] removing/)
+      .expect('stdout', /\[npmupdate] reinstall on /)
       .expect('code', 0)
       .end();
   });