diff --git a/src/.env.example b/src/.env.example
index c0660ea..ac0ea8b 100644
--- a/src/.env.example
+++ b/src/.env.example
@@ -7,6 +7,7 @@ APP_URL=http://localhost
 APP_LOCALE=en
 APP_FALLBACK_LOCALE=en
 APP_FAKER_LOCALE=en_US
+APP_TIMEZONE=Asia/Tokyo
 
 APP_MAINTENANCE_DRIVER=file
 # APP_MAINTENANCE_STORE=database
diff --git a/src/config/app.php b/src/config/app.php
index 423eed5..a66feb6 100644
--- a/src/config/app.php
+++ b/src/config/app.php
@@ -65,7 +65,7 @@
     |
     */
 
-    'timezone' => 'UTC',
+    'timezone' => env('APP_TIMEZONE', 'Asia/Tokyo'),
 
     /*
     |--------------------------------------------------------------------------