diff --git a/lib/commands/upgrade.dart b/lib/commands/upgrade.dart
new file mode 100644
index 0000000..5d01e8a
--- /dev/null
+++ b/lib/commands/upgrade.dart
@@ -0,0 +1,287 @@
+// Copyright 2021 Sony Group Corporation. All rights reserved.
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// @dart = 2.8
+
+import 'dart:convert';
+import 'dart:core';
+
+import 'package:flutter_tools/src/base/common.dart';
+import 'package:flutter_tools/src/base/io.dart';
+import 'package:flutter_tools/src/base/os.dart';
+import 'package:flutter_tools/src/base/process.dart';
+import 'package:flutter_tools/src/cache.dart';
+import 'package:flutter_tools/src/commands/upgrade.dart';
+import 'package:flutter_tools/src/dart/pub.dart';
+import 'package:flutter_tools/src/globals_null_migrated.dart' as globals;
+import 'package:flutter_tools/src/runner/flutter_command.dart';
+
+import 'package:meta/meta.dart';
+
+/// Source: [UpgradeCommand] in `upgrade.dart`
+class ELinuxUpgradeCommand extends UpgradeCommand {
+  ELinuxUpgradeCommand({
+    @required bool verboseHelp,
+  }) : super(verboseHelp: verboseHelp);
+
+  @override
+  Future<FlutterCommandResult> runCommand() {
+    final ELinuxUpgradeCommandRunner commandRunner =
+        ELinuxUpgradeCommandRunner();
+    commandRunner.workingDirectory = stringArg('working-directory') ??
+        globals.fs.directory(Cache.flutterRoot).parent.path;
+    return commandRunner.runCommand(
+      force: boolArg('force'),
+      continueFlow: boolArg('continue'),
+      testFlow: stringArg('working-directory') != null,
+      verifyOnly: boolArg('verify-only'),
+    );
+  }
+}
+
+class ELinuxGitTagVersion {
+  ELinuxGitTagVersion(
+    this.hash,
+    this.hashShort,
+    this.gitTag,
+  );
+
+  /// The git hash (or an abbreviation thereof) for this commit.
+  final String hash;
+
+  /// The git short hash (or an abbreviation thereof) for this commit.
+  final String hashShort;
+
+  /// The git tag that is this version's closest ancestor.
+  final String gitTag;
+}
+
+/// Source: [UpgradeCommandRunner] in `upgrade.dart`
+@visibleForTesting
+class ELinuxUpgradeCommandRunner {
+  String workingDirectory;
+
+  Future<FlutterCommandResult> runCommand({
+    @required bool force,
+    @required bool continueFlow,
+    @required bool testFlow,
+    @required bool verifyOnly,
+  }) async {
+    if (!continueFlow) {
+      await runCommandFirstHalf(
+        force: force,
+        testFlow: testFlow,
+        verifyOnly: verifyOnly,
+      );
+    } else {
+      await runCommandSecondHalf();
+    }
+    return FlutterCommandResult.success();
+  }
+
+  Future<void> runCommandFirstHalf({
+    @required bool force,
+    @required bool testFlow,
+    @required bool verifyOnly,
+  }) async {
+    final ELinuxGitTagVersion upstreamVersion = await fetchLatestVersion();
+    final ELinuxGitTagVersion currentVersion = await fetchCurrentVersion();
+
+    if (currentVersion.hash == upstreamVersion.hash) {
+      globals.printStatus('Flutter is already up to date');
+      globals.printStatus(upstreamVersion.gitTag);
+      return;
+    }
+
+    if (verifyOnly) {
+      globals.printStatus('A new version of Flutter is available\n');
+      globals.printStatus(
+          'The latest version: ${upstreamVersion.gitTag} (revision ${upstreamVersion.hashShort})',
+          emphasis: true);
+      globals.printStatus(
+          'Your current version: ${currentVersion.gitTag} (revision ${currentVersion.hashShort})\n');
+      globals.printStatus('To upgrade now, run "flutter-elinux upgrade".');
+      return;
+    }
+
+    globals.printStatus(
+        'Upgrading Flutter to ${upstreamVersion.gitTag} from ${currentVersion.gitTag} in $workingDirectory...');
+    await attemptReset(upstreamVersion.hash);
+    if (!testFlow) {
+      await flutterUpgradeContinue();
+    }
+  }
+
+  Future<ELinuxGitTagVersion> fetchLatestVersion() async {
+    String latestTag;
+    String latestTagHash;
+    try {
+      // Fetch upstream branch's commits and tags
+      await globals.processUtils.run(
+        <String>['git', 'fetch', '--tags'],
+        throwOnError: true,
+        workingDirectory: workingDirectory,
+      );
+
+      RunResult result = await globals.processUtils.run(
+        <String>['git', 'tag', '-l', '--sort=-v:refname'],
+        throwOnError: true,
+        workingDirectory: workingDirectory,
+      );
+      final List<String> tags =
+          const LineSplitter().convert(result.stdout.trim());
+      if (tags.isEmpty) {
+        throwToolExit(
+            'Unable to upgrade Flutter: Your Flutter checkout does not have any tags.\n'
+            'Re-install re-install flutter-elinux.');
+      }
+
+      // Gets the hash of the latest version.
+      latestTag = tags[0];
+      result = await globals.processUtils.run(
+        <String>['git', 'rev-parse', latestTag],
+        throwOnError: true,
+        workingDirectory: workingDirectory,
+      );
+      latestTagHash = result.stdout.trim();
+    } on Exception catch (_) {
+      throwToolExit(
+          'Unable to upgrade Flutter: The current Flutter branch/channel is '
+          'not tracking any remote repository.\n'
+          'Re-install re-install flutter-elinux.');
+    }
+    return ELinuxGitTagVersion(
+        latestTagHash, latestTagHash.substring(0, 10), latestTag);
+  }
+
+  Future<ELinuxGitTagVersion> fetchCurrentVersion() async {
+    String tag;
+    String tagHash;
+    try {
+      RunResult result = await globals.processUtils.run(
+        <String>['git', 'rev-parse', '--verify', 'HEAD'],
+        throwOnError: true,
+        workingDirectory: workingDirectory,
+      );
+      tagHash = result.stdout.trim();
+
+      result = await globals.processUtils.run(
+        <String>['git', 'describe', '--tags'],
+        throwOnError: true,
+        workingDirectory: workingDirectory,
+      );
+      tag = result.stdout.trim();
+    } on Exception catch (e) {
+      final String errorString = e.toString();
+      if (errorString.contains('fatal: HEAD does not point to a branch')) {
+        throwToolExit(
+            'Unable to upgrade Flutter: Your Flutter checkout is currently not '
+            'on a release branch.\n'
+            'Re-install re-install flutter-elinux.');
+      } else if (errorString
+          .contains('fatal: no upstream configured for branch')) {
+        throwToolExit(
+            'Unable to upgrade Flutter: The current Flutter branch/channel is '
+            'not tracking any remote repository.\n'
+            'Re-install re-install flutter-elinux.');
+      } else {
+        throwToolExit(errorString);
+      }
+    }
+    return ELinuxGitTagVersion(tagHash, tagHash.substring(0, 10), tag);
+  }
+
+  /// Source: [attemptReset] in `upgrade.dart` (exact copy)
+  Future<void> attemptReset(String newRevision) async {
+    try {
+      await globals.processUtils.run(
+        <String>['git', 'reset', '--hard', newRevision],
+        throwOnError: true,
+        workingDirectory: workingDirectory,
+      );
+    } on ProcessException catch (e) {
+      throwToolExit(e.message, exitCode: e.errorCode);
+    }
+  }
+
+  /// Source: [attemptReset] in `upgrade.dart`
+  Future<void> flutterUpgradeContinue() async {
+    final int code = await globals.processUtils.stream(
+      <String>[
+        globals.fs.path.join('bin', 'flutter-elinux'),
+        'upgrade',
+        '--continue',
+        '--no-version-check',
+      ],
+      workingDirectory: workingDirectory,
+      allowReentrantFlutter: true,
+      environment: Map<String, String>.of(globals.platform.environment),
+    );
+    if (code != 0) {
+      throwToolExit(null, exitCode: code);
+    }
+  }
+
+  /// Source: [runCommandSecondHalf] in `upgrade.dart`
+  Future<void> runCommandSecondHalf() async {
+    // Make sure the welcome message re-display is delayed until the end.
+    globals.persistentToolState.redisplayWelcomeMessage = false;
+    await precacheArtifacts();
+    await updatePackages();
+    await runDoctor();
+    // Force the welcome message to re-display following the upgrade.
+    globals.persistentToolState.redisplayWelcomeMessage = true;
+  }
+
+  /// Source: [precacheArtifacts] in `upgrade.dart`
+  Future<void> precacheArtifacts() async {
+    globals.printStatus('');
+    globals.printStatus('Upgrading engine...');
+    final int code = await globals.processUtils.stream(
+      <String>[
+        globals.fs.path.join('bin', 'flutter-elinux'),
+        '--no-color',
+        '--no-version-check',
+        'precache',
+      ],
+      workingDirectory: workingDirectory,
+      allowReentrantFlutter: true,
+      environment: Map<String, String>.of(globals.platform.environment),
+    );
+    if (code != 0) {
+      throwToolExit(null, exitCode: code);
+    }
+  }
+
+  /// Source: [updatePackages] in `upgrade.dart`
+  Future<void> updatePackages() async {
+    globals.printStatus('');
+    final String projectRoot = findProjectRoot(globals.fs);
+    if (projectRoot != null) {
+      globals.printStatus('');
+      await pub.get(
+        context: PubContext.pubUpgrade,
+        directory: projectRoot,
+        upgrade: true,
+        generateSyntheticPackage: false,
+      );
+    }
+  }
+
+  /// Source: [runDoctor] in `upgrade.dart`
+  Future<void> runDoctor() async {
+    globals.printStatus('');
+    globals.printStatus('Running flutter doctor...');
+    await globals.processUtils.stream(
+      <String>[
+        globals.fs.path.join('bin', 'flutter-elinux'),
+        '--no-version-check',
+        'doctor',
+      ],
+      workingDirectory: workingDirectory,
+      allowReentrantFlutter: true,
+    );
+  }
+}
diff --git a/lib/executable.dart b/lib/executable.dart
index 9f966b3..ce3595a 100644
--- a/lib/executable.dart
+++ b/lib/executable.dart
@@ -43,6 +43,7 @@ import 'commands/packages.dart';
 import 'commands/precache.dart';
 import 'commands/run.dart';
 import 'commands/test.dart';
+import 'commands/upgrade.dart';
 import 'elinux_cache.dart';
 import 'elinux_device_discovery.dart';
 import 'elinux_doctor.dart';
@@ -94,6 +95,7 @@ Future<void> main(List<String> args) async {
       LogsCommand(),
       ScreenshotCommand(),
       SymbolizeCommand(stdio: globals.stdio, fileSystem: globals.fs),
+      ELinuxUpgradeCommand(verboseHelp: verboseHelp),
       // Commands extended for ELinux.
       ELinuxAnalyzeCommand(verboseHelp: verboseHelp),
       ELinuxAttachCommand(verboseHelp: verboseHelp),