diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7b0b5c6..dfa5c9b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### New features
+
+- Support `rubocop.formatAutocorrectsAll` command, which requires RuboCop 1.56+. (@koic)
+
 ## 0.5.0 (2023-08-05)
 
 ### New features
diff --git a/README.md b/README.md
index 4c15b8f..5a5c639 100644
--- a/README.md
+++ b/README.md
@@ -213,7 +213,7 @@ the extension's behavior in other workspace folders.
 
 In addition to the built-in VS Code Formatting API, you can trigger the
 extension to format and autocorrect the current file listing by running
-the command "RuboCop: Format with Autocorrects":
+the command "RuboCop: Format with Autocorrects". This is equivalent to `rubocop -a`:
 
 ![Autocorrect command](/docs/autocorrect-command.png)
 
@@ -237,6 +237,15 @@ Or, in `keybindings.json`:
 ]
 ```
 
+You can also trigger the extension to format and autocorrect all the current file listing by running
+the command "RuboCop: Format All with Autocorrects". This is equivalent to `rubocop -A`:
+
+![Autocorrect all command](/docs/autocorrect-all-command.png)
+
+**This command "RuboCop: Format All with Autocorrects" requires RuboCop 1.56+ to be enabled.**
+
+You can use two autocorrect commands depending on the purpose.
+
 ## Decoding the Status Bar item
 
 The extension also includes a status bar item to convey the status of the
diff --git a/docs/autocorrect-all-command.png b/docs/autocorrect-all-command.png
new file mode 100644
index 0000000..8ba81b8
Binary files /dev/null and b/docs/autocorrect-all-command.png differ
diff --git a/package.json b/package.json
index 50da78f..dbd3197 100644
--- a/package.json
+++ b/package.json
@@ -53,6 +53,10 @@
         "command": "rubocop.formatAutocorrects",
         "title": "RuboCop: Format with Autocorrects"
       },
+      {
+        "command": "rubocop.formatAutocorrectsAll",
+        "title": "RuboCop: Format All with Autocorrects"
+      },
       {
         "command": "rubocop.showOutputChannel",
         "title": "RuboCop: Show Output Channel"
diff --git a/src/extension.ts b/src/extension.ts
index 45ad9e9..a9fe221 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -96,7 +96,8 @@ function registerCommands(): Disposable[] {
     commands.registerCommand('rubocop.stop', stopLanguageServer),
     commands.registerCommand('rubocop.restart', restartLanguageServer),
     commands.registerCommand('rubocop.showOutputChannel', () => outputChannel?.show()),
-    commands.registerCommand('rubocop.formatAutocorrects', formatAutocorrects)
+    commands.registerCommand('rubocop.formatAutocorrects', formatAutocorrects),
+    commands.registerCommand('rubocop.formatAutocorrectsAll', formatAutocorrectsAll)
   ];
 }
 
@@ -400,12 +401,20 @@ async function restartLanguageServer(): Promise<void> {
 }
 
 async function formatAutocorrects(): Promise<void> {
+  await executeCommand('rubocop.formatAutocorrects');
+}
+
+async function formatAutocorrectsAll(): Promise<void> {
+  await executeCommand('rubocop.formatAutocorrectsAll');
+}
+
+async function executeCommand(command: string): Promise<void> {
   const editor = window.activeTextEditor;
   if (editor == null || languageClient == null || !supportedLanguage(editor.document.languageId)) return;
 
   try {
     await languageClient.sendRequest(ExecuteCommandRequest.type, {
-      command: 'rubocop.formatAutocorrects',
+      command,
       arguments: [{
         uri: editor.document.uri.toString(),
         version: editor.document.version
diff --git a/src/test/suite/automation.ts b/src/test/suite/automation.ts
index 1651494..3568ccd 100644
--- a/src/test/suite/automation.ts
+++ b/src/test/suite/automation.ts
@@ -32,6 +32,10 @@ export async function formatAutocorrects(): Promise<void> {
   return await commands.executeCommand('rubocop.formatAutocorrects');
 }
 
+export async function formatAutocorrectsAll(): Promise<void> {
+  return await commands.executeCommand('rubocop.formatAutocorrectsAll');
+}
+
 export async function restart(): Promise<void> {
   return await commands.executeCommand('rubocop.restart');
 }
diff --git a/src/test/suite/index.test.ts b/src/test/suite/index.test.ts
index 2fa6a4c..70d3c06 100644
--- a/src/test/suite/index.test.ts
+++ b/src/test/suite/index.test.ts
@@ -12,7 +12,16 @@ const UNFORMATTED = `class Foo
 end
 `;
 
-const FORMATTED = `class Foo
+const SAFE_FORMATTED = `class Foo
+  def bar
+    puts 'baz'
+  end
+end
+`;
+
+const UNSAFE_FORMATTED = `# frozen_string_literal: true
+
+class Foo
   def bar
     puts 'baz'
   end
@@ -48,13 +57,19 @@ suite('RuboCop', () => {
     test('format', async() => {
       const editor = await auto.createEditor(UNFORMATTED);
       await auto.formatDocument();
-      assert.equal(editor.document.getText(), FORMATTED);
+      assert.equal(editor.document.getText(), SAFE_FORMATTED);
     });
 
-    test('format with custom command', async() => {
+    test('format with custom command `rubocop.formatAutocorrects`', async() => {
       const editor = await auto.createEditor(UNFORMATTED);
       await auto.formatAutocorrects();
-      assert.equal(editor.document.getText(), FORMATTED);
+      assert.equal(editor.document.getText(), SAFE_FORMATTED);
+    });
+
+    test('format with custom command `rubocop.formatAutocorrectsAll`', async() => {
+      const editor = await auto.createEditor(UNFORMATTED);
+      await auto.formatAutocorrectsAll();
+      assert.equal(editor.document.getText(), UNSAFE_FORMATTED);
     });
   });
 });