diff --git a/database/migrations/2025_10_15_012803_update_alipay_account_add_app_private_key.php b/database/migrations/2025_10_15_012803_update_alipay_account_add_app_private_key.php
index 135e30e..2e977d6 100644
--- a/database/migrations/2025_10_15_012803_update_alipay_account_add_app_private_key.php
+++ b/database/migrations/2025_10_15_012803_update_alipay_account_add_app_private_key.php
@@ -14,7 +14,7 @@ class UpdateAlipayAccountAddAppPrivateKey extends Migration
     public function up()
     {
         Schema::table('alipay_account', function (Blueprint $table) {
-            $table->string('private_key')->nullable()->comment('应用私钥')->after('appid');
+            $table->string('private_key', 5120)->nullable()->comment('应用私钥')->after('appid');
         });
     }