diff --git a/README.md b/README.md
index a79c7db..b6dd667 100644
--- a/README.md
+++ b/README.md
@@ -56,6 +56,7 @@ $ ./vendor/bin/dependency-visualizer -h
 
 Usage: dependency-visualizer [options] <target php file>
 Options:
+  -d: Load Xdebug.
   -h: Show this help.
   -l: Output log to current directory.
   -m: Draw methods in diagram.
diff --git a/bin/dependency-visualizer b/bin/dependency-visualizer
index 5e301e6..d4a524a 100755
--- a/bin/dependency-visualizer
+++ b/bin/dependency-visualizer
@@ -3,6 +3,7 @@
 
 namespace Hirokinoue\DependencyVisualizer;
 
+use Composer\XdebugHandler\XdebugHandler;
 use Hirokinoue\DependencyVisualizer\Config\Config;
 use Hirokinoue\DependencyVisualizer\Exporter\Exporter;
 use Hirokinoue\DependencyVisualizer\Exporter\PlantUmlExporter;
@@ -21,6 +22,7 @@ list($options, $file) = parseArgs($argv);
 if ($options['help']) {
     echo 'Usage: dependency-visualizer [options] <target php file>' . PHP_EOL;
     echo 'Options:' . PHP_EOL;
+    echo '  -d: Load Xdebug.' . PHP_EOL;
     echo '  -h: Show this help.' . PHP_EOL;
     echo '  -l: Output log to current directory.' . PHP_EOL;
     echo '  -m: Draw methods in diagram.' . PHP_EOL;
@@ -28,6 +30,11 @@ if ($options['help']) {
     exit(0);
 }
 
+if ($options['loadXdebug'] === false) {
+    $xdebug = new XdebugHandler('dependency-visualizer');
+    $xdebug->check();
+    unset($xdebug);
+}
 Config::initialize(\getcwd());
 
 ini_set('memory_limit', Config::memoryLimit());
@@ -36,6 +43,7 @@ Logger::initialize($options['log']);
 
 Logger::info('autoload file has been loaded', ['path' => $loadedFile ?? '']);
 Logger::info('start analyzing', ['target' => $file]);
+Logger::info('Xdebug is ' . (extension_loaded('xdebug') ? 'enabled.' : 'disabled.'));
 
 try {
     $dependencyVisualizer = DependencyVisualizer::create($file);
@@ -63,6 +71,7 @@ function exporterFactory($options): Exporter {
 
 function parseArgs($args): array {
     $options = [
+        'loadXdebug' => false,
         'help' => false,
         'log' => false,
         'drawMethod' => false,
@@ -71,6 +80,9 @@ function parseArgs($args): array {
     $file = '';
     foreach ($args as $arg) {
         switch ($arg) {
+            case '-d':
+                $options['loadXdebug'] = true;
+                break;
             case '-h':
                 $options['help'] = true;
                 break;
diff --git a/composer.json b/composer.json
index fade6fa..a5f8f0a 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,8 @@
     "require": {
         "php": "^7.4|^8.0",
         "nikic/php-parser": "^5.0",
-        "monolog/monolog": "^2.5"
+        "monolog/monolog": "^2.5",
+        "composer/xdebug-handler": "^3.0"
     },
     "require-dev": {
         "phpunit/phpunit": "^8.5",
diff --git a/composer.lock b/composer.lock
index 37149d0..0489f9d 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,8 +4,145 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "61979d561d98dfaaae51620c29cbae9a",
+    "content-hash": "dd5a9407ff4d6af4c3eed3f3f5270cf8",
     "packages": [
+        {
+            "name": "composer/pcre",
+            "version": "3.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/pcre.git",
+                "reference": "00104306927c7a0919b4ced2aaa6782c1e61a3c9"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/pcre/zipball/00104306927c7a0919b4ced2aaa6782c1e61a3c9",
+                "reference": "00104306927c7a0919b4ced2aaa6782c1e61a3c9",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.4 || ^8.0"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.3",
+                "phpstan/phpstan-strict-rules": "^1.1",
+                "symfony/phpunit-bridge": "^5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-main": "3.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Pcre\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                }
+            ],
+            "description": "PCRE wrapping library that offers type-safe preg_* replacements.",
+            "keywords": [
+                "PCRE",
+                "preg",
+                "regex",
+                "regular expression"
+            ],
+            "support": {
+                "issues": "https://github.com/composer/pcre/issues",
+                "source": "https://github.com/composer/pcre/tree/3.1.1"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2023-10-11T07:11:09+00:00"
+        },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "3.0.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "ced299686f41dce890debac69273b47ffe98a40c"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/ced299686f41dce890debac69273b47ffe98a40c",
+                "reference": "ced299686f41dce890debac69273b47ffe98a40c",
+                "shasum": ""
+            },
+            "require": {
+                "composer/pcre": "^1 || ^2 || ^3",
+                "php": "^7.2.5 || ^8.0",
+                "psr/log": "^1 || ^2 || ^3"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "^1.0",
+                "phpstan/phpstan-strict-rules": "^1.1",
+                "symfony/phpunit-bridge": "^6.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without Xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "support": {
+                "irc": "irc://irc.freenode.org/composer",
+                "issues": "https://github.com/composer/xdebug-handler/issues",
+                "source": "https://github.com/composer/xdebug-handler/tree/3.0.3"
+            },
+            "funding": [
+                {
+                    "url": "https://packagist.com",
+                    "type": "custom"
+                },
+                {
+                    "url": "https://github.com/composer",
+                    "type": "github"
+                },
+                {
+                    "url": "https://tidelift.com/funding/github/packagist/composer/composer",
+                    "type": "tidelift"
+                }
+            ],
+            "time": "2022-02-25T21:32:43+00:00"
+        },
         {
             "name": "monolog/monolog",
             "version": "2.9.2",