diff --git a/.eslintrc.cjs b/.eslintrc.cjs
index 5ff8656..7939aa8 100644
--- a/.eslintrc.cjs
+++ b/.eslintrc.cjs
@@ -1,3 +1,5 @@
+const os = require('os');
+
 module.exports = {
   root: true,
   parser: '@typescript-eslint/parser',
@@ -21,6 +23,7 @@ module.exports = {
     'no-sync': 'error',
     'prefer-promise-reject-errors': 'off',
     'n/prefer-promises/fs': 'error',
+    'prettier/prettier': os.platform() === 'win32' ? 'off' : 'error',
     '@typescript-eslint/no-floating-promises': [
       'error',
       {
diff --git a/package.json b/package.json
index 99984fe..da3c0d0 100644
--- a/package.json
+++ b/package.json
@@ -51,6 +51,10 @@
         "title": "phpfmt: Format This File",
         "when": "!inOutput && editorFocus && editorLangId == php"
       },
+      {
+        "command": "phpfmt.upgradeFmt",
+        "title": "phpfmt: Upgrade fmt.phar or fmt.stub.php"
+      },
       {
         "command": "phpfmt.listTransformations",
         "title": "phpfmt: List Transformations"
diff --git a/src/PHPFmtProvider.ts b/src/PHPFmtProvider.ts
index cbaaac8..5b3315f 100644
--- a/src/PHPFmtProvider.ts
+++ b/src/PHPFmtProvider.ts
@@ -12,11 +12,14 @@ import {
   type QuickPickItem,
   type WorkspaceConfiguration
 } from 'vscode';
+import path from 'path';
+import fs from 'fs';
 import pkg from 'pjson';
 import type { PHPFmt } from './PHPFmt';
 import type { Widget } from './Widget';
 import type { Transformation } from './Transformation';
 import { PHPFmtIgnoreError } from './PHPFmtError';
+import { downloadFile } from './utils';
 
 export class PHPFmtProvider {
   private readonly documentSelector: DocumentSelector;
@@ -53,6 +56,43 @@ export class PHPFmtProvider {
     });
   }
 
+  public registerUpgradeFmtCommand(): Disposable {
+    return Commands.registerCommand('phpfmt.upgradeFmt', async () => {
+      try {
+        const destFile = this.phpfmt.getFmt().pharPath;
+        const bakFile = `${this.phpfmt.getFmt().pharPath}.bak`;
+
+        const baseDir = path.resolve(destFile, '..');
+        const installFile = path.join(baseDir, 'install.js');
+        const installContent = String(await fs.promises.readFile(installFile));
+        const regex = /(var|const|let)\s+url\s+=\s+'(https?:\/\/[^']+)'/s;
+        const match = installContent.match(regex);
+        if (match?.[2]) {
+          const url = match[2];
+
+          await fs.promises.copyFile(destFile, bakFile);
+
+          try {
+            await downloadFile(url, destFile);
+          } catch (err) {
+            this.widget.logError('Download failed', err);
+            await fs.promises.copyFile(bakFile, destFile);
+          }
+
+          await Window.showInformationMessage(
+            'fmt.phar or fmt.stub.php upgraded successfully!'
+          );
+        } else {
+          throw new Error('Failed to get url in modules');
+        }
+      } catch (err) {
+        await Window.showErrorMessage(
+          'fmt.phar or fmt.stub.php upgraded failed!'
+        );
+      }
+    });
+  }
+
   private async getTransformationItems(): Promise<QuickPickItem[]> {
     const transformationItems = await this.transformation.getTransformations();
     const items = transformationItems.map(o => ({
diff --git a/src/extension.ts b/src/extension.ts
index 5994303..5425b62 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -12,6 +12,7 @@ export function activate(context: ExtensionContext): void {
   context.subscriptions.push(
     provider.registerOnDidChangeConfiguration(),
     provider.registerFormatCommand(),
+    provider.registerUpgradeFmtCommand(),
     provider.registerListTransformationsCommand(),
     ...provider.registerToggleTransformationsCommand(),
     ...provider.registerToggleBooleanCommand(),
diff --git a/src/utils.ts b/src/utils.ts
index 8222f56..a861e35 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -1,4 +1,47 @@
-import childProcess from 'child_process';
-import util from 'util';
+import childProcess, { type ExecOptions } from 'child_process';
+import fs, { type ObjectEncodingOptions } from 'fs';
+import https from 'https';
 
-export const exec = util.promisify(childProcess.exec);
+export const exec = async (
+  command: string,
+  options?: (ObjectEncodingOptions & ExecOptions) | undefined | null
+): Promise<{ stdout: string; stderr: string }> => {
+  return await new Promise((resolve, reject) => {
+    const child = childProcess.exec(
+      command,
+      options,
+      (error, stdout, stderr) => {
+        if (error != null) {
+          reject(error);
+        } else {
+          resolve({
+            stdout: String(stdout),
+            stderr: String(stderr)
+          });
+        }
+      }
+    );
+
+    child.on('error', reject);
+  });
+};
+
+export const downloadFile = async (
+  url: string,
+  filePath: string
+): Promise<void> => {
+  await new Promise<void>((resolve, reject) => {
+    https
+      .get(url, res => {
+        const dest = fs.createWriteStream(filePath, {
+          autoClose: true
+        });
+        res.pipe(dest).on('finish', () => {
+          resolve();
+        });
+      })
+      .on('error', err => {
+        reject(err);
+      });
+  });
+};