diff --git a/.github/dependabot.yml b/.github/dependabot.yml
index 46783880e4..a939885b70 100644
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@@ -6,3 +6,15 @@ updates:
       interval: "weekly"
     allow:
       - dependency-type: "all"
+
+  # GitHub アクションの依存関係を維持する
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+
+  # npm の依存関係を維持する
+  - package-ecosystem: "npm"
+    directory: "/"
+    schedule:
+      interval: "weekly"
diff --git a/.github/workflows/e2e-tests.yml b/.github/workflows/e2e-tests.yml
index 92259a1d2e..2267bffa42 100644
--- a/.github/workflows/e2e-tests.yml
+++ b/.github/workflows/e2e-tests.yml
@@ -19,6 +19,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        pattern:
+          - 'test:e2e'
+          - 'test:e2e-extends'
         group:
           - 'test/front_login'
           - 'test/front_guest'
@@ -35,6 +38,9 @@ jobs:
     - name: Setup environment
       run: echo "COMPOSE_FILE=docker-compose.yml:docker-compose.pgsql.yml:docker-compose.dev.yml:docker-compose.owaspzap.yml:docker-compose.owaspzap.daemon.yml" >> $GITHUB_ENV
 
+    - if: matrix.pattern == 'test:e2e-extends'
+      run: cp -rp tests/class/fixtures/page_extends/* data/class_extends/page_extends
+
     - name: Setup to EC-CUBE
       env:
         HTTP_URL: https://127.0.0.1:8085/
@@ -58,11 +64,12 @@ jobs:
     - name: Run to E2E testing
       env:
         GROUP: ${{ matrix.group }}
+        PATTERN: ${{ matrix.pattern }}
         HTTPS_PROXY: 'localhost:8090'
         HTTP_PROXY: 'localhost:8090'
         CI: 1
         FORCE_COLOR: 1
-      run: yarn test:e2e e2e-tests/${GROUP}
+      run: yarn ${PATTERN} e2e-tests/${GROUP}
 
     - name: Upload evidence
       if: failure()
diff --git a/composer.json b/composer.json
index c0bbac0197..29263b233c 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,6 @@
     },
     "require-dev": {
         "fzaninotto/faker": "^1.8",
-        "guzzlehttp/guzzle": "^5.3",
         "nanasess/eccube2-fixture-generator": "^1.1",
         "nanasess/ec-cube2-class-extends-stubs": "^1.0",
         "php5friends/phpunit48": ">=4.8.41"
diff --git a/composer.lock b/composer.lock
index 7460eaaf7c..eaf37535eb 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": "aa69a1cefb969fb840164cf96cb39350",
+    "content-hash": "af90042f8bc44df63d44bc963ea3f29e",
     "packages": [
         {
             "name": "mobiledetect/mobiledetectlib",
@@ -905,174 +905,6 @@
             "abandoned": true,
             "time": "2020-12-11T09:56:16+00:00"
         },
-        {
-            "name": "guzzlehttp/guzzle",
-            "version": "5.3.4",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/guzzle/guzzle.git",
-                "reference": "b87eda7a7162f95574032da17e9323c9899cb6b2"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/guzzle/zipball/b87eda7a7162f95574032da17e9323c9899cb6b2",
-                "reference": "b87eda7a7162f95574032da17e9323c9899cb6b2",
-                "shasum": ""
-            },
-            "require": {
-                "guzzlehttp/ringphp": "^1.1",
-                "php": ">=5.4.0",
-                "react/promise": "^2.2"
-            },
-            "require-dev": {
-                "ext-curl": "*",
-                "phpunit/phpunit": "^4.0"
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                }
-            ],
-            "description": "Guzzle is a PHP HTTP client library and framework for building RESTful web service clients",
-            "homepage": "http://guzzlephp.org/",
-            "keywords": [
-                "client",
-                "curl",
-                "framework",
-                "http",
-                "http client",
-                "rest",
-                "web service"
-            ],
-            "support": {
-                "issues": "https://github.com/guzzle/guzzle/issues",
-                "source": "https://github.com/guzzle/guzzle/tree/5.3"
-            },
-            "time": "2019-10-30T09:32:00+00:00"
-        },
-        {
-            "name": "guzzlehttp/ringphp",
-            "version": "1.1.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/guzzle/RingPHP.git",
-                "reference": "5e2a174052995663dd68e6b5ad838afd47dd615b"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/RingPHP/zipball/5e2a174052995663dd68e6b5ad838afd47dd615b",
-                "reference": "5e2a174052995663dd68e6b5ad838afd47dd615b",
-                "shasum": ""
-            },
-            "require": {
-                "guzzlehttp/streams": "~3.0",
-                "php": ">=5.4.0",
-                "react/promise": "~2.0"
-            },
-            "require-dev": {
-                "ext-curl": "*",
-                "phpunit/phpunit": "~4.0"
-            },
-            "suggest": {
-                "ext-curl": "Guzzle will use specific adapters if cURL is present"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "1.1-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\Ring\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                }
-            ],
-            "description": "Provides a simple API and specification that abstracts away the details of HTTP into a single PHP function.",
-            "support": {
-                "issues": "https://github.com/guzzle/RingPHP/issues",
-                "source": "https://github.com/guzzle/RingPHP/tree/1.1.1"
-            },
-            "abandoned": true,
-            "time": "2018-07-31T13:22:33+00:00"
-        },
-        {
-            "name": "guzzlehttp/streams",
-            "version": "3.0.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/guzzle/streams.git",
-                "reference": "47aaa48e27dae43d39fc1cea0ccf0d84ac1a2ba5"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/guzzle/streams/zipball/47aaa48e27dae43d39fc1cea0ccf0d84ac1a2ba5",
-                "reference": "47aaa48e27dae43d39fc1cea0ccf0d84ac1a2ba5",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.4.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "~4.0"
-            },
-            "type": "library",
-            "extra": {
-                "branch-alias": {
-                    "dev-master": "3.0-dev"
-                }
-            },
-            "autoload": {
-                "psr-4": {
-                    "GuzzleHttp\\Stream\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Michael Dowling",
-                    "email": "mtdowling@gmail.com",
-                    "homepage": "https://github.com/mtdowling"
-                }
-            ],
-            "description": "Provides a simple abstraction over streams of data",
-            "homepage": "http://guzzlephp.org/",
-            "keywords": [
-                "Guzzle",
-                "stream"
-            ],
-            "support": {
-                "issues": "https://github.com/guzzle/streams/issues",
-                "source": "https://github.com/guzzle/streams/tree/master"
-            },
-            "abandoned": true,
-            "time": "2014-10-12T19:18:40+00:00"
-        },
         {
             "name": "nanasess/ec-cube2-class-extends-stubs",
             "version": "1.0.0",
@@ -1743,82 +1575,6 @@
             "abandoned": true,
             "time": "2015-10-02T06:51:40+00:00"
         },
-        {
-            "name": "react/promise",
-            "version": "v2.9.0",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/reactphp/promise.git",
-                "reference": "234f8fd1023c9158e2314fa9d7d0e6a83db42910"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/reactphp/promise/zipball/234f8fd1023c9158e2314fa9d7d0e6a83db42910",
-                "reference": "234f8fd1023c9158e2314fa9d7d0e6a83db42910",
-                "shasum": ""
-            },
-            "require": {
-                "php": ">=5.4.0"
-            },
-            "require-dev": {
-                "phpunit/phpunit": "^9.3 || ^5.7 || ^4.8.36"
-            },
-            "type": "library",
-            "autoload": {
-                "files": [
-                    "src/functions_include.php"
-                ],
-                "psr-4": {
-                    "React\\Promise\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "MIT"
-            ],
-            "authors": [
-                {
-                    "name": "Jan Sorgalla",
-                    "email": "jsorgalla@gmail.com",
-                    "homepage": "https://sorgalla.com/"
-                },
-                {
-                    "name": "Christian Lück",
-                    "email": "christian@clue.engineering",
-                    "homepage": "https://clue.engineering/"
-                },
-                {
-                    "name": "Cees-Jan Kiewiet",
-                    "email": "reactphp@ceesjankiewiet.nl",
-                    "homepage": "https://wyrihaximus.net/"
-                },
-                {
-                    "name": "Chris Boden",
-                    "email": "cboden@gmail.com",
-                    "homepage": "https://cboden.dev/"
-                }
-            ],
-            "description": "A lightweight implementation of CommonJS Promises/A for PHP",
-            "keywords": [
-                "promise",
-                "promises"
-            ],
-            "support": {
-                "issues": "https://github.com/reactphp/promise/issues",
-                "source": "https://github.com/reactphp/promise/tree/v2.9.0"
-            },
-            "funding": [
-                {
-                    "url": "https://github.com/WyriHaximus",
-                    "type": "github"
-                },
-                {
-                    "url": "https://github.com/clue",
-                    "type": "github"
-                }
-            ],
-            "time": "2022-02-11T10:27:51+00:00"
-        },
         {
             "name": "sebastian/comparator",
             "version": "1.2.4",
@@ -2311,5 +2067,5 @@
     "platform-overrides": {
         "php": "5.4.16"
     },
-    "plugin-api-version": "2.3.0"
+    "plugin-api-version": "2.1.0"
 }
diff --git a/data/class/SC_ClassAutoloader.php b/data/class/SC_ClassAutoloader.php
index 9ed4dd2c63..323cfd672a 100644
--- a/data/class/SC_ClassAutoloader.php
+++ b/data/class/SC_ClassAutoloader.php
@@ -48,7 +48,11 @@ public static function autoload($class, $plugin_upload_realdir = PLUGIN_UPLOAD_R
             $arrClassNamePartTemp = $arrClassNamePart;
             // FIXME クラスファイルのディレクトリ命名が変。変な現状に合わせて強引な処理をしてる。
             $arrClassNamePartTemp[1] = $arrClassNamePartTemp[1] . '_extends';
-            $classpath .= strtolower(implode('/', array_slice($arrClassNamePartTemp, 1, -2))) . '/';
+            if ($count <= 5 && $arrClassNamePart[2] === 'Admin' && !in_array($arrClassNamePart[3], ['Home', 'Index', 'Logout'])) {
+                $classpath .= strtolower(implode('/', array_slice($arrClassNamePartTemp, 1, -1))) . '/';
+            } else {
+                $classpath .= strtolower(implode('/', array_slice($arrClassNamePartTemp, 1, -2))) . '/';
+            }
         } elseif ($arrClassNamePart[0] === 'SC' && $is_ex === false && $count >= 3) {
             $classpath .= strtolower(implode('/', array_slice($arrClassNamePart, 1, -1))) . '/';
         } elseif ($arrClassNamePart[0] === 'SC') {
diff --git a/data/class/SC_SendMail.php b/data/class/SC_SendMail.php
index d7e8b6a145..70c9228820 100644
--- a/data/class/SC_SendMail.php
+++ b/data/class/SC_SendMail.php
@@ -340,6 +340,7 @@ public function sendMail($isHtml = false)
             $msg = mb_convert_encoding($result->getMessage(), CHAR_CODE, 'auto');
             $msg = 'メール送信に失敗しました。[' . $msg . ']';
             trigger_error($msg, E_USER_WARNING);
+            GC_Utils_Ex::gfPrintLog($result->getMessage());
             GC_Utils_Ex::gfDebugLog($header);
 
             return false;
diff --git a/data/module/Net/Socket.php b/data/module/Net/Socket.php
index 2fee65cd2c..d9edceef27 100644
--- a/data/module/Net/Socket.php
+++ b/data/module/Net/Socket.php
@@ -644,6 +644,7 @@ function enableCrypto($enabled, $type)
             if (!is_resource($this->fp)) {
                 return $this->raiseError('not connected');
             }
+            stream_context_set_option($this->fp, 'ssl', 'verify_peer_name', false);
             return @stream_socket_enable_crypto($this->fp, $enabled, $type);
         } else {
             $msg = 'Net_Socket::enableCrypto() requires php version >= 5.1.0';
diff --git a/data/module/Net/URL.php b/data/module/Net/URL.php
index dc03705189..005890b462 100644
--- a/data/module/Net/URL.php
+++ b/data/module/Net/URL.php
@@ -106,16 +106,6 @@ class Net_URL
     */
     var $useBrackets;
 
-    /**
-    * PHP4 Constructor
-    *
-    * @see __construct()
-    */
-    function Net_URL($url = null, $useBrackets = true)
-    {
-        $this->__construct($url, $useBrackets);
-    }
-
     /**
     * PHP5 Constructor
     *
@@ -127,7 +117,7 @@ function Net_URL($url = null, $useBrackets = true)
     *                            multiple querystrings with the same name
     *                            exist
     */
-    function __construct($url = null, $useBrackets = true)
+    public function __construct($url = null, $useBrackets = true)
     {
         $this->url = $url;
         $this->useBrackets = $useBrackets;
diff --git a/e2e-tests/test/admin/customer/edit.test.ts b/e2e-tests/test/admin/customer/edit.test.ts
new file mode 100644
index 0000000000..6629dae6f0
--- /dev/null
+++ b/e2e-tests/test/admin/customer/edit.test.ts
@@ -0,0 +1,22 @@
+import { test, expect } from '@playwright/test';
+import PlaywrightConfig from '../../../../playwright.config';
+import { ZapClient, ContextType } from '../../../utils/ZapClient';
+const zapClient = new ZapClient();
+
+const url = `${PlaywrightConfig.use.baseURL}/admin/customer/edit.php`;
+test.describe.serial('会員登録画面のテストをします', () => {
+  test.beforeAll(async () => {
+    await zapClient.startSession(ContextType.Admin, 'admin_customer_edit')
+      .then(async () => expect(await zapClient.isForcedUserModeEnabled()).toBeTruthy());
+  });
+
+  test('会員登録画面のテストをします', async ( { page }) => {
+    await page.goto(url);
+    await expect(page.locator('h1')).toContainText(/会員登録/);
+  });
+
+  test('LC_Page_Admin_Customer_Edit_Ex クラスのテストをします @extends', async ( { page }) => {
+    await page.goto(url);
+    await expect(page.locator('h1')).toContainText(/カスタマイズ/);
+  });
+});
diff --git a/e2e-tests/test/admin/home.test.ts b/e2e-tests/test/admin/home.test.ts
index 4e6bde2349..24efb02199 100644
--- a/e2e-tests/test/admin/home.test.ts
+++ b/e2e-tests/test/admin/home.test.ts
@@ -1,28 +1,28 @@
 import { test, expect, chromium, Page } from '@playwright/test';
 import { ADMIN_DIR } from '../../config/default.config';
+import { ZapClient, ContextType } from '../../utils/ZapClient';
+const zapClient = new ZapClient();
 
-const url = `/${ADMIN_DIR}index.php`;
+const url = `/${ADMIN_DIR}/home.php`;
 
-test.describe.serial('管理画面に正常にログインできるか確認します', () => {
+test.describe.serial('管理画面Homeの確認をします', () => {
   let page: Page;
   test.beforeAll(async () => {
+    await zapClient.startSession(ContextType.Admin, 'admin_home')
+      .then(async () => expect(await zapClient.isForcedUserModeEnabled()).toBeTruthy());
     const browser = await chromium.launch();
 
     page = await browser.newPage();
     await page.goto(url);
   });
 
-  test('ログイン画面を確認します', async () => {
-    await expect(page.locator('#login-form')).toContainText(/LOGIN/);
-  });
-
-  test('ログインします', async () => {
-    await page.fill('input[name=login_id]', 'admin');
-    await page.fill('input[name=password]', 'password');
-    await page.click('text=LOGIN');
+  test('システム情報を確認します', async ({ page }) => {
+    await page.goto(url);
+    await expect(page.locator('.shop-info >> nth=0 >> tr >> nth=0 >> td')).toContainText('2.17');
   });
 
-  test('ログインしたのを確認します', async () => {
-    await expect(page.locator('#site-check')).toContainText('ログイン : 管理者 様');
+  test('LC_Page_Admin_Home_Ex クラスのテストをします @extends', async ({ page }) => {
+    await page.goto(url);
+    await expect(page.locator('.shop-info >> nth=0 >> tr >> nth=1 >> td')).toContainText('PHP_VERSION_ID');
   });
 });
diff --git a/e2e-tests/test/admin/index.test.ts b/e2e-tests/test/admin/index.test.ts
new file mode 100644
index 0000000000..4e6bde2349
--- /dev/null
+++ b/e2e-tests/test/admin/index.test.ts
@@ -0,0 +1,28 @@
+import { test, expect, chromium, Page } from '@playwright/test';
+import { ADMIN_DIR } from '../../config/default.config';
+
+const url = `/${ADMIN_DIR}index.php`;
+
+test.describe.serial('管理画面に正常にログインできるか確認します', () => {
+  let page: Page;
+  test.beforeAll(async () => {
+    const browser = await chromium.launch();
+
+    page = await browser.newPage();
+    await page.goto(url);
+  });
+
+  test('ログイン画面を確認します', async () => {
+    await expect(page.locator('#login-form')).toContainText(/LOGIN/);
+  });
+
+  test('ログインします', async () => {
+    await page.fill('input[name=login_id]', 'admin');
+    await page.fill('input[name=password]', 'password');
+    await page.click('text=LOGIN');
+  });
+
+  test('ログインしたのを確認します', async () => {
+    await expect(page.locator('#site-check')).toContainText('ログイン : 管理者 様');
+  });
+});
diff --git a/e2e-tests/test/admin/total/total.test.ts b/e2e-tests/test/admin/total/total.test.ts
index 1d9496f82e..50565cba3c 100644
--- a/e2e-tests/test/admin/total/total.test.ts
+++ b/e2e-tests/test/admin/total/total.test.ts
@@ -309,4 +309,9 @@ test.describe.serial('売上集計画面を確認をします', () => {
         .then(file => expect(file.split('\r\n').length).toBeGreaterThanOrEqual(2));
     });
   });
+
+  test('LC_Page_Admin_Total_Ex クラスのテストをします @extends', async ( { page }) => {
+    await page.goto(url);
+    await expect(page.locator('h1')).toContainText(/カスタマイズ/);
+  });
 });
diff --git a/e2e-tests/test/front_guest/welcome.test.ts b/e2e-tests/test/front_guest/welcome.test.ts
new file mode 100644
index 0000000000..94477161ac
--- /dev/null
+++ b/e2e-tests/test/front_guest/welcome.test.ts
@@ -0,0 +1,30 @@
+import { test, expect, chromium, Page } from '@playwright/test';
+
+const url = '/index.php';
+
+test.describe.serial('トップページのテストをします', () => {
+  let page: Page;
+  test.beforeAll(async () => {
+    const browser = await chromium.launch();
+    page = await browser.newPage();
+    await page.goto(url);
+  });
+
+  test('TOPページが正常に見られているかを確認します', async () => {
+    await expect(page.locator('#site_description')).toHaveText('EC-CUBE発!世界中を旅して見つけた立方体グルメを立方隊長が直送！');
+    await expect(page.locator('#main_image')).toBeVisible();
+  });
+
+  test('body の class 名出力を確認します', async () => {
+    await expect(page.locator('body')).toHaveAttribute('class', 'LC_Page_Index');
+  });
+
+  test('システムエラーが出ていないのを確認します', async () => {
+    await expect(page.locator('.error')).not.toBeVisible();
+  });
+
+  test('LC_Page_Index_Ex クラスのテストをします @extends', async ( { page }) => {
+    await page.goto(url);
+    await expect(page).toHaveTitle(/カスタマイズ/);
+  });
+});
diff --git a/e2e-tests/test/front_login/mypage/change.test.ts b/e2e-tests/test/front_login/mypage/change.test.ts
new file mode 100644
index 0000000000..d7345787f7
--- /dev/null
+++ b/e2e-tests/test/front_login/mypage/change.test.ts
@@ -0,0 +1,22 @@
+import { test, expect } from '@playwright/test';
+import PlaywrightConfig from '../../../../playwright.config';
+import { ZapClient, ContextType } from '../../../utils/ZapClient';
+const zapClient = new ZapClient();
+
+const url = `${PlaywrightConfig.use.baseURL}/mypage/change.php`;
+test.describe.serial('会員登録内容変更画面のテストをします', () => {
+  test.beforeAll(async () => {
+    await zapClient.startSession(ContextType.FrontLogin, 'front_login_mypage_change')
+      .then(async () => expect(await zapClient.isForcedUserModeEnabled()).toBeTruthy());
+  });
+
+  test('会員登録内容変更画面のテストをします', async ( { page }) => {
+    await page.goto(url);
+    await expect(page).toHaveTitle(/会員登録内容変更/);
+  });
+
+  test('LC_Page_Mypage_Change_Ex クラスのテストをします @extends', async ( { page }) => {
+    await page.goto(url);
+    await expect(page).toHaveTitle(/カスタマイズ/);
+  });
+});
diff --git a/e2e-tests/test/front_login/welcome.test.ts b/e2e-tests/test/front_login/welcome.test.ts
index 26aa1b0148..94477161ac 100644
--- a/e2e-tests/test/front_login/welcome.test.ts
+++ b/e2e-tests/test/front_login/welcome.test.ts
@@ -22,4 +22,9 @@ test.describe.serial('トップページのテストをします', () => {
   test('システムエラーが出ていないのを確認します', async () => {
     await expect(page.locator('.error')).not.toBeVisible();
   });
+
+  test('LC_Page_Index_Ex クラスのテストをします @extends', async ( { page }) => {
+    await page.goto(url);
+    await expect(page).toHaveTitle(/カスタマイズ/);
+  });
 });
diff --git a/package.json b/package.json
index c9c54add69..5ed3d3ca7f 100644
--- a/package.json
+++ b/package.json
@@ -7,16 +7,16 @@
   "license": "GPL",
   "dependencies": {
     "@babel/polyfill": "^7.12.1",
-    "css-loader": "^6.6.0",
+    "css-loader": "^6.7.1",
     "date-fns": "^2.28.0",
     "jquery": "3",
     "jquery-colorbox": "^1.6.4",
     "jquery-easing": "^0.0.1",
-    "jquery-migrate": "^3.1.0",
+    "jquery-migrate": "^3.4.0",
     "slick-carousel": "^1.8.1",
     "style-loader": "^3.3.0",
     "url-loader": "^4.1.1",
-    "webpack": "^5.69.1"
+    "webpack": "^5.73.0"
   },
   "devDependencies": {
     "@babel/core": "^7.17.5",
@@ -42,7 +42,8 @@
   "scripts": {
     "lint:javascript": "eslint --fix data/*.js",
     "lint:typescript": "eslint --fix --ext .ts e2e-tests",
-    "test:e2e": "playwright test --grep-invert @attack",
-    "test:attack": "playwright test"
+    "test:e2e": "playwright test --grep-invert '(@attack|@extends)'",
+    "test:e2e-extends": "playwright test --grep @extends",
+    "test:attack": "playwright test --grep-invert @extends"
   }
 }
diff --git a/tests/class/Common_TestCase.php b/tests/class/Common_TestCase.php
index 01c5b2dcf1..f3e006a132 100644
--- a/tests/class/Common_TestCase.php
+++ b/tests/class/Common_TestCase.php
@@ -74,9 +74,13 @@ protected function verify($message = null)
     protected function checkMailCatcherStatus()
     {
         try {
-            $client = new \GuzzleHttp\Client(['base_url' => self::MAILCATCHER_URL]);
-            $response = $client->get('/messages');
-            if ($response->getStatusCode() !== 200) {
+            $context = stream_context_create(array(
+                'http' => array('ignore_errors' => true)
+            ));
+            $response = file_get_contents(self::MAILCATCHER_URL.'/messages', false, $context);
+
+            $http_status = strpos($http_response_header[0], '200');
+            if ($http_status === false) {
                 $this->markTestSkipped('MailCatcher is not available');
             }
         } catch (Exception $e) {
@@ -90,8 +94,16 @@ protected function checkMailCatcherStatus()
     protected function resetEmails()
     {
         try {
-            $client = new \GuzzleHttp\Client(['base_url' => self::MAILCATCHER_URL]);
-            $client->delete('/messages');
+            $context = stream_context_create(
+                array(
+                    'http' => array(
+                        'method'=> 'DELETE'
+                    )
+                )
+            );
+
+            file_get_contents(self::MAILCATCHER_URL.'/messages', false, $context);
+
         } catch (\Exception $e) {
             // quiet
         }
@@ -104,10 +116,7 @@ protected function resetEmails()
      */
     protected function getMailCatcherMessages()
     {
-        $client = new \GuzzleHttp\Client(['base_url' => self::MAILCATCHER_URL]);
-        $response = $client->get('/messages');
-
-        return json_decode($response->getBody(true), true);
+        return json_decode(file_get_contents(self::MAILCATCHER_URL. '/messages'), true);
     }
 
     /**
@@ -116,14 +125,11 @@ protected function getMailCatcherMessages()
      * @param int $id メッセージの ID
      * @return array MailCatcher のメッセージ
      */
-    protected function getMailCatcherMessage($id)
+    protected function getMailCatcherMessage($message)
     {
-        $client = new \GuzzleHttp\Client(['base_url' => self::MAILCATCHER_URL]);
-        $response = $client->get('/messages/'.$id.'.json');
-
-        $message = json_decode($response->getBody(true), true);
+        $source = file_get_contents(self::MAILCATCHER_URL. '/messages/'.$message['id'].'.source');
 
-        $message['source'] = quoted_printable_decode($message['source']);
+        $message['source'] = quoted_printable_decode($source);
         $message['source'] = mb_convert_encoding($message['source'], 'UTF-8', 'JIS');
         return $message;
     }
@@ -141,7 +147,7 @@ protected function getLastMailCatcherMessage()
         }
 
         $last = array_shift($messages);
-        return $this->getMailCatcherMessage($last['id']);
+        return $this->getMailCatcherMessage($last);
     }
 
 
diff --git a/tests/class/fixtures/page_extends/LC_Page_Index_Ex.php b/tests/class/fixtures/page_extends/LC_Page_Index_Ex.php
new file mode 100644
index 0000000000..440737ead7
--- /dev/null
+++ b/tests/class/fixtures/page_extends/LC_Page_Index_Ex.php
@@ -0,0 +1,14 @@
+<?php
+class LC_Page_Index_Ex extends LC_Page_Index
+{
+    public function init()
+    {
+        parent::init();
+        $this->tpl_subtitle = '(カスタマイズ)';
+    }
+
+    public function process()
+    {
+        parent::process();
+    }
+}
diff --git a/tests/class/fixtures/page_extends/admin/LC_Page_Admin_Home_Ex.php b/tests/class/fixtures/page_extends/admin/LC_Page_Admin_Home_Ex.php
new file mode 100644
index 0000000000..9a75c4cbaf
--- /dev/null
+++ b/tests/class/fixtures/page_extends/admin/LC_Page_Admin_Home_Ex.php
@@ -0,0 +1,21 @@
+<?php
+class LC_Page_Admin_Home_Ex extends LC_Page_Admin_Home
+{
+    public function init()
+    {
+        parent::init();
+    }
+
+    public function process()
+    {
+        parent::process();
+    }
+
+    /**
+     * @override
+     */
+    public function lfGetPHPVersion()
+    {
+        return 'PHP_VERSION_ID: '.PHP_VERSION_ID;
+    }
+}
diff --git a/tests/class/fixtures/page_extends/admin/customer/LC_Page_Admin_Customer_Edit_Ex.php b/tests/class/fixtures/page_extends/admin/customer/LC_Page_Admin_Customer_Edit_Ex.php
new file mode 100644
index 0000000000..b2c37fd5f0
--- /dev/null
+++ b/tests/class/fixtures/page_extends/admin/customer/LC_Page_Admin_Customer_Edit_Ex.php
@@ -0,0 +1,14 @@
+<?php
+class LC_Page_Admin_Customer_Edit_Ex extends LC_Page_Admin_Customer_Edit
+{
+    public function init()
+    {
+        parent::init();
+        $this->tpl_subtitle = '会員登録(カスタマイズ)';
+    }
+
+    public function process()
+    {
+        parent::process();
+    }
+}
diff --git a/tests/class/fixtures/page_extends/admin/total/LC_Page_Admin_Total_Ex.php b/tests/class/fixtures/page_extends/admin/total/LC_Page_Admin_Total_Ex.php
new file mode 100644
index 0000000000..4c30c5dfa4
--- /dev/null
+++ b/tests/class/fixtures/page_extends/admin/total/LC_Page_Admin_Total_Ex.php
@@ -0,0 +1,14 @@
+<?php
+class LC_Page_Admin_Total_Ex extends LC_Page_Admin_Total
+{
+    public function init()
+    {
+        parent::init();
+        $this->tpl_maintitle = '売上集計(カスタマイズ)';
+    }
+
+    public function process()
+    {
+        parent::process();
+    }
+}
diff --git a/tests/class/fixtures/page_extends/mypage/LC_Page_Mypage_Change_Ex.php b/tests/class/fixtures/page_extends/mypage/LC_Page_Mypage_Change_Ex.php
new file mode 100644
index 0000000000..642499f265
--- /dev/null
+++ b/tests/class/fixtures/page_extends/mypage/LC_Page_Mypage_Change_Ex.php
@@ -0,0 +1,14 @@
+<?php
+class LC_Page_Mypage_Change_Ex extends LC_Page_Mypage_Change
+{
+    public function init()
+    {
+        parent::init();
+        $this->tpl_subtitle = '会員登録内容変更(カスタマイズ)';
+    }
+
+    public function process()
+    {
+        parent::process();
+    }
+}
diff --git a/tests/require.php b/tests/require.php
index aa427b1e4a..73154f19eb 100644
--- a/tests/require.php
+++ b/tests/require.php
@@ -7,8 +7,10 @@
     exit(1);
 }
 
-class_exists('FPDI'); // XXX PHPStan が FPDI を見つけてくれないのでロードしておく
-class_exists('Smarty'); // XXX PHPStan が Smarty を見つけてくれないのでロードしておく
+// XXX PHPStan が見つけてくれないライブラリをロードしておく
+class_exists('FPDI');
+class_exists('Smarty');
+class_exists('MDB2');
 
 if (!class_exists('PHPUnit_Framework_TestCase')) {
     class_alias('PHPUnit\Framework\TestCase', 'PHPUnit_Framework_TestCase');
diff --git a/yarn.lock b/yarn.lock
index 9e5318ee31..b22341cd5d 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1446,11 +1446,16 @@ acorn-jsx@^5.3.1:
   resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-5.3.2.tgz#7ed5bb55908b3b2f1bc55c6af1653bada7f07937"
   integrity sha512-rq9s+JNhf0IChjtDXxllJ7g41oZk5SlXtp0LHwyA5cejwn7vKmKp4pPri6YEePv2PU65sAsegbXtIinmDFDXgQ==
 
-acorn@^8.4.1, acorn@^8.5.0, acorn@^8.7.0:
+acorn@^8.5.0, acorn@^8.7.0:
   version "8.7.0"
   resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.7.0.tgz#90951fde0f8f09df93549481e5fc141445b791cf"
   integrity sha512-V/LGr1APy+PXIwKebEWrkZPwoeoF+w1jiOBUmuxuiUIaOHtob8Qc9BTrYo7VuI5fR8tqsy+buA2WFooR5olqvQ==
 
+acorn@^8.7.1:
+  version "8.8.0"
+  resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.8.0.tgz#88c0187620435c7f6015803f5539dae05a9dbea8"
+  integrity sha512-QOxyigPVrpZ2GXT+PFyZTl6TtOFc5egxHIP9IlQ+RbupQuX4RkT/Bee4/kQuC02Xkzg84JcT7oLYtDIQxp+v7w==
+
 agent-base@6, agent-base@^6.0.2:
   version "6.0.2"
   resolved "https://registry.yarnpkg.com/agent-base/-/agent-base-6.0.2.tgz#49fff58577cfee3f37176feab4c22e00f86d7f77"
@@ -1837,13 +1842,13 @@ cross-spawn@^7.0.2, cross-spawn@^7.0.3:
     shebang-command "^2.0.0"
     which "^2.0.1"
 
-css-loader@^6.6.0:
-  version "6.6.0"
-  resolved "https://registry.yarnpkg.com/css-loader/-/css-loader-6.6.0.tgz#c792ad5510bd1712618b49381bd0310574fafbd3"
-  integrity sha512-FK7H2lisOixPT406s5gZM1S3l8GrfhEBT3ZiL2UX1Ng1XWs0y2GPllz/OTyvbaHe12VgQrIXIzuEGVlbUhodqg==
+css-loader@^6.7.1:
+  version "6.7.1"
+  resolved "https://registry.yarnpkg.com/css-loader/-/css-loader-6.7.1.tgz#e98106f154f6e1baf3fc3bc455cb9981c1d5fd2e"
+  integrity sha512-yB5CNFa14MbPJcomwNh3wLThtkZgcNyI2bNMRt8iE5Z8Vwl7f8vQXFAzn2HDOJvtDq2NTZBUGMSUNNyrv3/+cw==
   dependencies:
     icss-utils "^5.1.0"
-    postcss "^8.4.5"
+    postcss "^8.4.7"
     postcss-modules-extract-imports "^3.0.0"
     postcss-modules-local-by-default "^4.0.0"
     postcss-modules-scope "^3.0.0"
@@ -1962,10 +1967,10 @@ end-of-stream@^1.1.0:
   dependencies:
     once "^1.4.0"
 
-enhanced-resolve@^5.8.3:
-  version "5.9.1"
-  resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-5.9.1.tgz#e898cea44d9199fd92137496cff5691b910fb43e"
-  integrity sha512-jdyZMwCQ5Oj4c5+BTnkxPgDZO/BJzh/ADDmKebayyzNwjVX1AFCeGkOfxNx0mHi2+8BKC5VxUYiw3TIvoT7vhw==
+enhanced-resolve@^5.10.0:
+  version "5.10.0"
+  resolved "https://registry.yarnpkg.com/enhanced-resolve/-/enhanced-resolve-5.10.0.tgz#0dc579c3bb2a1032e357ac45b8f3a6f3ad4fb1e6"
+  integrity sha512-T0yTFjdpldGY8PmuXXR0PyQ1ufZpEGiHVrp7zHKB7jdR4qlmZHhONVM5AQOAWXuF/w3dnHbEQVrNptJgt7F+cQ==
   dependencies:
     graceful-fs "^4.2.4"
     tapable "^2.2.0"
@@ -2864,10 +2869,10 @@ jquery-easing@^0.0.1:
   dependencies:
     jquery "*"
 
-jquery-migrate@^3.1.0:
-  version "3.3.2"
-  resolved "https://registry.yarnpkg.com/jquery-migrate/-/jquery-migrate-3.3.2.tgz#7829ee24de3054d0d2f42dd093390d8a7b7af01a"
-  integrity sha512-L3gYhr7yEtLUSAeqXSicVa0vRD4aGwjw/bWY8YzrO2o/qDY1BaMyP3oB3bZf5Auy3Hu9ynliio0CTyDWCBPVDw==
+jquery-migrate@^3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/jquery-migrate/-/jquery-migrate-3.4.0.tgz#915d6e914c76bd7410a58c86d20fec0052784af9"
+  integrity sha512-K0W02EhZyqjVpyF5pdi+t238cIfQACzMsXiX4AEfEOxPPfiZZFzf3brtFY21FOOEPiWZF4mH04TXHDE6e2YDyg==
 
 jquery@*, jquery@3, jquery@>=1.3.2:
   version "3.6.0"
@@ -2901,10 +2906,10 @@ jsesc@~0.5.0:
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
   integrity sha1-597mbjXW/Bb3EP6R1c9p9w8IkR0=
 
-json-parse-better-errors@^1.0.2:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/json-parse-better-errors/-/json-parse-better-errors-1.0.2.tgz#bb867cfb3450e69107c131d1c514bab3dc8bcaa9"
-  integrity sha512-mrqyZKfX5EhL7hvqcV6WG1yYjnjeuYDzDhhcAAUrq8Po85NBQBJP+ZDUT75qZQ98IkUoBqdkExkukOU7Ts2wrw==
+json-parse-even-better-errors@^2.3.1:
+  version "2.3.1"
+  resolved "https://registry.yarnpkg.com/json-parse-even-better-errors/-/json-parse-even-better-errors-2.3.1.tgz#7c47805a94319928e05777405dc12e1f7a4ee02d"
+  integrity sha512-xyFwyhro/JEof6Ghe2iz2NcXoj2sloNsWr/XsERDK/oiPCfaNhl5ONfp+jQdAZRQQ0IJWNzH9zIZF7li91kh2w==
 
 json-schema-traverse@^0.4.1:
   version "0.4.1"
@@ -3137,10 +3142,10 @@ ms@2.1.3, ms@^2.1.1:
   resolved "https://registry.yarnpkg.com/ms/-/ms-2.1.3.tgz#574c8138ce1d2b5861f0b44579dbadd60c6615b2"
   integrity sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==
 
-nanoid@^3.3.1:
-  version "3.3.1"
-  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.1.tgz#6347a18cac88af88f58af0b3594b723d5e99bb35"
-  integrity sha512-n6Vs/3KGyxPQd6uO0eH4Bv0ojGSUvuLlIHtC3Y0kEO23YRge8H9x1GCzLn28YX0H66pMkxuaeESFq4tKISKwdw==
+nanoid@^3.3.4:
+  version "3.3.4"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.4.tgz#730b67e3cd09e2deacf03c027c81c9d9dbc5e8ab"
+  integrity sha512-MqBkQh/OHTS2egovRtLk45wEyNXwF+cokD+1YPf9u5VfJiRdAiRwB2froX5Co9Rh20xs4siNPm8naNotSD6RBw==
 
 natural-compare@^1.4.0:
   version "1.4.0"
@@ -3434,12 +3439,12 @@ postcss-value-parser@^4.1.0, postcss-value-parser@^4.2.0:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.2.0.tgz#723c09920836ba6d3e5af019f92bc0971c02e514"
   integrity sha512-1NNCs6uurfkVbeXG4S8JFT9t19m45ICnif8zWLd5oPSZ50QnwMfK+H3jv408d4jw/7Bttv5axS5IiHoLaVNHeQ==
 
-postcss@^8.4.5:
-  version "8.4.7"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.7.tgz#f99862069ec4541de386bf57f5660a6c7a0875a8"
-  integrity sha512-L9Ye3r6hkkCeOETQX6iOaWZgjp3LL6Lpqm6EtgbKrgqGGteRMNb9vzBfRL96YOSu8o7x3MfIH9Mo5cPJFGrW6A==
+postcss@^8.4.7:
+  version "8.4.14"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.14.tgz#ee9274d5622b4858c1007a74d76e42e56fd21caf"
+  integrity sha512-E398TUmfAYFPBSdzgeieK2Y1+1cpdxJx8yXbK/m57nRhKSmk1GB2tO4lbLBtlkfPQTDKfe4Xqv1ASWPpayPEig==
   dependencies:
-    nanoid "^3.3.1"
+    nanoid "^3.3.4"
     picocolors "^1.0.0"
     source-map-js "^1.0.2"
 
@@ -4113,10 +4118,10 @@ verror@1.10.0:
     core-util-is "1.0.2"
     extsprintf "^1.2.0"
 
-watchpack@^2.3.1:
-  version "2.3.1"
-  resolved "https://registry.yarnpkg.com/watchpack/-/watchpack-2.3.1.tgz#4200d9447b401156eeca7767ee610f8809bc9d25"
-  integrity sha512-x0t0JuydIo8qCNctdDrn1OzH/qDzk2+rdCOC3YzumZ42fiMqmQ7T3xQurykYMhYfHaPHTp4ZxAx2NfUo1K6QaA==
+watchpack@^2.4.0:
+  version "2.4.0"
+  resolved "https://registry.yarnpkg.com/watchpack/-/watchpack-2.4.0.tgz#fa33032374962c78113f93c7f2fb4c54c9862a5d"
+  integrity sha512-Lcvm7MGST/4fup+ifyKi2hjyIAwcdI4HRgtvTpIUxBRhB+RFtUh8XtDOxUfctVCnhVi+QQj49i91OyvzkJl6cg==
   dependencies:
     glob-to-regexp "^0.4.1"
     graceful-fs "^4.1.2"
@@ -4152,34 +4157,34 @@ webpack-sources@^3.2.3:
   resolved "https://registry.yarnpkg.com/webpack-sources/-/webpack-sources-3.2.3.tgz#2d4daab8451fd4b240cc27055ff6a0c2ccea0cde"
   integrity sha512-/DyMEOrDgLKKIG0fmvtz+4dUX/3Ghozwgm6iPp8KRhvn+eQf9+Q7GWxVNMk3+uCPWfdXYC4ExGBckIXdFEfH1w==
 
-webpack@^5.69.1:
-  version "5.69.1"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-5.69.1.tgz#8cfd92c192c6a52c99ab00529b5a0d33aa848dc5"
-  integrity sha512-+VyvOSJXZMT2V5vLzOnDuMz5GxEqLk7hKWQ56YxPW/PQRUuKimPqmEIJOx8jHYeyo65pKbapbW464mvsKbaj4A==
+webpack@^5.73.0:
+  version "5.74.0"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-5.74.0.tgz#02a5dac19a17e0bb47093f2be67c695102a55980"
+  integrity sha512-A2InDwnhhGN4LYctJj6M1JEaGL7Luj6LOmyBHjcI8529cm5p6VXiTIW2sn6ffvEAKmveLzvu4jrihwXtPojlAA==
   dependencies:
     "@types/eslint-scope" "^3.7.3"
     "@types/estree" "^0.0.51"
     "@webassemblyjs/ast" "1.11.1"
     "@webassemblyjs/wasm-edit" "1.11.1"
     "@webassemblyjs/wasm-parser" "1.11.1"
-    acorn "^8.4.1"
+    acorn "^8.7.1"
     acorn-import-assertions "^1.7.6"
     browserslist "^4.14.5"
     chrome-trace-event "^1.0.2"
-    enhanced-resolve "^5.8.3"
+    enhanced-resolve "^5.10.0"
     es-module-lexer "^0.9.0"
     eslint-scope "5.1.1"
     events "^3.2.0"
     glob-to-regexp "^0.4.1"
     graceful-fs "^4.2.9"
-    json-parse-better-errors "^1.0.2"
+    json-parse-even-better-errors "^2.3.1"
     loader-runner "^4.2.0"
     mime-types "^2.1.27"
     neo-async "^2.6.2"
     schema-utils "^3.1.0"
     tapable "^2.1.1"
     terser-webpack-plugin "^5.1.3"
-    watchpack "^2.3.1"
+    watchpack "^2.4.0"
     webpack-sources "^3.2.3"
 
 which-boxed-primitive@^1.0.2: