diff --git a/app/Models/Transaction.php b/app/Models/Transaction.php
index af66427..66aad03 100644
--- a/app/Models/Transaction.php
+++ b/app/Models/Transaction.php
@@ -83,6 +83,9 @@ public function getDrops($user_id = null)
             'drops' => 0,
         ]);
 
+        // 保留 5 位
+        $drops['drops'] = round($drops['drops'], 5);
+
         return $drops['drops'];
     }