diff --git a/src/Commands/BreezejpCommand.php b/src/Commands/BreezejpCommand.php
index 94d4be7..14f8aba 100644
--- a/src/Commands/BreezejpCommand.php
+++ b/src/Commands/BreezejpCommand.php
@@ -25,36 +25,71 @@ public function handle(): int
         (new Filesystem)->ensureDirectoryExists(lang_path());
         (new Filesystem)->copyDirectory(__DIR__.'/../../stubs/lang/', lang_path());
 
-        $this->info('config/app.phpのlocaleをjaにします');
-        // Read the contents of the file into a string
-        $configfile = file_get_contents(base_path('config/app.php'));
+        if (file_exists(base_path("config/app.php"))) {
+            $this->info('config/app.phpのlocaleをjaにします');
+            // Read the contents of the file into a string
+            $configfile = file_get_contents(base_path('config/app.php'));
+
+            // Modify the contents of the string
+            $configfile = str_replace("'locale' => 'en'", "'locale' => 'ja'", $configfile);
+            $configfile = str_replace("'faker_locale' => 'en_US'", "'faker_locale' => 'ja_JP'", $configfile);
+            $configfile = str_replace("'timezone' => 'UTC'", "'timezone' => 'Asia/Tokyo'", $configfile);
+
+            // Save the modified contents back to the file
+            file_put_contents(base_path('config/app.php'), $configfile);
+
+            if ($this->confirm('GitHubリポジトリにスターの御協力をお願いします🙏', true)) {
+                $repoUrl = 'https://github.com/askdkc/breezejp';
+
+                if (PHP_OS_FAMILY == 'Darwin') {
+                    exec("open {$repoUrl}");
+                }
+                if (PHP_OS_FAMILY == 'Windows') {
+                    exec("start {$repoUrl}");
+                }
+                if (PHP_OS_FAMILY == 'Linux') {
+                    exec("xdg-open {$repoUrl}");
+                }
+
+                $this->line('Thank you! / ありがとう💓');
+            }
 
-        // Modify the contents of the string
-        $configfile = str_replace("'locale' => 'en'", "'locale' => 'ja'", $configfile);
-        $configfile = str_replace("'faker_locale' => 'en_US'", "'faker_locale' => 'ja_JP'", $configfile);
-        $configfile = str_replace("'timezone' => 'UTC'", "'timezone' => 'Asia/Tokyo'", $configfile);
+            $this->info('日本語ファイルのインストールが完了しました!');
 
-        // Save the modified contents back to the file
-        file_put_contents(base_path('config/app.php'), $configfile);
+            return self::SUCCESS;
 
-        if ($this->confirm('GitHubリポジトリにスターの御協力をお願いします🙏', true)) {
-            $repoUrl = 'https://github.com/askdkc/breezejp';
+        }
 
-            if (PHP_OS_FAMILY == 'Darwin') {
-                exec("open {$repoUrl}");
-            }
-            if (PHP_OS_FAMILY == 'Windows') {
-                exec("start {$repoUrl}");
-            }
-            if (PHP_OS_FAMILY == 'Linux') {
-                exec("xdg-open {$repoUrl}");
-            }
 
-            $this->line('Thank you! / ありがとう💓');
-        }
+        // For Laravel 11 and above
+        $this->info('.envのlocaleをjaにします');
+            // Read the contents of the file into a string
+            $configfile = file_get_contents(base_path('.env'));
 
-        $this->info('日本語ファイルのインストールが完了しました!');
+            // Modify the contents of the string
+            $configfile = str_replace("'locale' => 'en'", "'locale' => 'ja'", $configfile);
+            $configfile = str_replace("'faker_locale' => 'en_US'", "'faker_locale' => 'ja_JP'", $configfile);
+            $configfile = str_replace("'timezone' => 'UTC'", "'timezone' => 'Asia/Tokyo'", $configfile);
+
+            // Save the modified contents back to the file
+            file_put_contents(base_path('.env'), $configfile);
+
+            if ($this->confirm('GitHubリポジトリにスターの御協力をお願いします🙏', true)) {
+                $repoUrl = 'https://github.com/askdkc/breezejp';
+
+                if (PHP_OS_FAMILY == 'Darwin') {
+                    exec("open {$repoUrl}");
+                }
+                if (PHP_OS_FAMILY == 'Windows') {
+                    exec("start {$repoUrl}");
+                }
+                if (PHP_OS_FAMILY == 'Linux') {
+                    exec("xdg-open {$repoUrl}");
+                }
+
+                $this->line('Thank you! / ありがとう💓');
+            }
 
-        return self::SUCCESS;
+        
     }
 }