diff --git a/composer.json b/composer.json
index 275105ad0d..02284dba1d 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "nanasess/ec-cube2-class-extends-stubs": "^1.0",
         "nanasess/eccube2-fixture-generator": "^2.0",
         "phpdocumentor/reflection-docblock": "~5.5.1",
-        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan": "^2.0",
         "phpunit/phpunit": "^9.6",
         "symfony/yaml": "^5.4 || ^6.4"
     },
diff --git a/composer.lock b/composer.lock
index c82bc6192d..606c77ddae 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "636ee3a24be4e148cef2625409af2b8c",
+    "content-hash": "8193790eda3917eed8b2431b71f28b80",
     "packages": [
         {
             "name": "mobiledetect/mobiledetectlib",
@@ -2125,20 +2125,20 @@
         },
         {
             "name": "phpstan/phpstan",
-            "version": "1.12.7",
+            "version": "2.0.3",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/phpstan.git",
-                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0"
+                "reference": "46b4d3529b12178112d9008337beda0cc2a1a6b4"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
-                "reference": "dc2b9976bd8b0f84ec9b0e50cc35378551de7af0",
+                "url": "https://api.github.com/repos/phpstan/phpstan/zipball/46b4d3529b12178112d9008337beda0cc2a1a6b4",
+                "reference": "46b4d3529b12178112d9008337beda0cc2a1a6b4",
                 "shasum": ""
             },
             "require": {
-                "php": "^7.2|^8.0"
+                "php": "^7.4|^8.0"
             },
             "conflict": {
                 "phpstan/phpstan-shim": "*"
@@ -2179,7 +2179,7 @@
                     "type": "github"
                 }
             ],
-            "time": "2024-10-18T11:12:07+00:00"
+            "time": "2024-11-28T22:19:37+00:00"
         },
         {
             "name": "phpunit/php-code-coverage",
diff --git a/data/class/pages/admin/system/LC_Page_Admin_System_Bkup.php b/data/class/pages/admin/system/LC_Page_Admin_System_Bkup.php
index 9a3efde2ea..bf8229f3cb 100644
--- a/data/class/pages/admin/system/LC_Page_Admin_System_Bkup.php
+++ b/data/class/pages/admin/system/LC_Page_Admin_System_Bkup.php
@@ -213,7 +213,7 @@ public function action()
         $arrBkupList = $this->lfGetBkupData('ORDER BY create_date DESC');
         // テンプレートファイルに渡すデータをセット
         $this->arrErr = isset($arrErr) ? $arrErr : [];
-        $this->arrForm = isset($arrForm) ? $arrForm : [];
+        $this->arrForm = $arrForm;
         $this->arrBkupList = $arrBkupList;
     }
 
diff --git a/data/class/pages/products/LC_Page_Products_Detail.php b/data/class/pages/products/LC_Page_Products_Detail.php
index 807e064ccf..ea3afe3d46 100644
--- a/data/class/pages/products/LC_Page_Products_Detail.php
+++ b/data/class/pages/products/LC_Page_Products_Detail.php
@@ -21,9 +21,6 @@
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
 
-if (file_exists(MODULE_REALDIR.'mdl_gmopg/inc/function.php')) {
-    require_once MODULE_REALDIR.'mdl_gmopg/inc/function.php';
-}
 /**
  * 商品詳細 のページクラス.
  *
diff --git a/data/require_plugin.php b/data/require_plugin.php
deleted file mode 100644
index fec67cff48..0000000000
--- a/data/require_plugin.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-/*
- * This file is part of EC-CUBE
- *
- * Copyright(c) EC-CUBE CO.,LTD. All Rights Reserved.
- *
- * http://www.ec-cube.co.jp/
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
- */
-
-require_once (PLUGIN_UPLOAD_REALDIR . 'SC_Plugin_Base.php');
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index d23977b88b..2e1b6745f2 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -41,3 +41,25 @@ parameters:
     -
       message: "#^Inner named functions are not supported by PHPStan\\.#"
       path: data/class/SC_Initial.php
+    -
+      message: '#^Path in include_once\(\) "Auth/SASL.php" is not a file or it does not exist.#'
+      path: data/module/Net/SMTP.php
+    -
+      message: '#^Path in require_once\(\) ".*\.php" is not a file or it does not exist\.$#'
+      paths:
+        - data/module/Calendar/Calendar.php
+        - data/module/Calendar/Day.php
+        - data/module/Calendar/Decorator/Textual.php
+        - data/module/Calendar/Decorator/Uri.php
+        - data/module/Calendar/Decorator/Weekday.php
+        - data/module/Calendar/Decorator/Wrapper.php
+        - data/module/Calendar/Factory.php
+        - data/module/Calendar/Hour.php
+        - data/module/Calendar/Minute.php
+        - data/module/Calendar/Month.php
+        - data/module/Calendar/Month/Weekdays.php
+        - data/module/Calendar/Month/Weeks.php
+        - data/module/Calendar/Second.php
+        - data/module/Calendar/Util/Textual.php
+        - data/module/Calendar/Week.php
+        - data/module/Calendar/Year.php