diff --git a/app/Http/Controllers/UserController.php b/app/Http/Controllers/UserController.php
index beb463c..8f6f909 100644
--- a/app/Http/Controllers/UserController.php
+++ b/app/Http/Controllers/UserController.php
@@ -102,7 +102,7 @@ SQL
         }
 
         // 月間グラフ用の配列初期化
-        $month = Carbon::now()->subMonth(11)->firstOfMonth(); // 直近12ヶ月
+        $month = Carbon::now()->firstOfMonth()->subMonth(11); // 直近12ヶ月
         for ($i = 0; $i < 12; $i++) {
             $monthlySum[$month->format('Y/m')] = 0;
             $month->addMonth();