diff --git a/.github/workflows/ter-release.yml b/.github/workflows/ter-release.yml
index b8c74ce..839f30e 100644
--- a/.github/workflows/ter-release.yml
+++ b/.github/workflows/ter-release.yml
@@ -24,7 +24,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.4'
+          php-version: '8.1'
           extensions: intl, mbstring, xml, soap, zip, curl
 
       - name: Install EXT:tailor
diff --git a/Classes/Controller/ProfileController.php b/Classes/Controller/ProfileController.php
index 93d1268..ac83a1f 100644
--- a/Classes/Controller/ProfileController.php
+++ b/Classes/Controller/ProfileController.php
@@ -2,6 +2,7 @@
 declare(strict_types=1);
 namespace In2code\Instagram\Controller;
 
+use Psr\Http\Message\ResponseInterface;
 use In2code\Instagram\Domain\Repository\FeedRepository;
 use In2code\Instagram\Domain\Repository\TokenRepository;
 use TYPO3\CMS\Extbase\Mvc\Controller\ActionController;
@@ -35,7 +36,7 @@ public function __construct(FeedRepository $feedRepository, TokenRepository $tok
     /**
      * @return void
      */
-    public function showAction()
+    public function showAction(): ResponseInterface
     {
         $feed = $this->feedRepository->findDataByUsername((string)$this->settings['username']);
         $this->view->assignMultiple([
@@ -43,5 +44,6 @@ public function showAction()
             'feed' => $feed,
             'token' => $this->tokenRepository->findValidTokenByUsername((string)$this->settings['username'])
         ]);
+        return $this->htmlResponse();
     }
 }
diff --git a/Configuration/TCA/Overrides/sys_template.php b/Configuration/TCA/Overrides/sys_template.php
index 915b4cc..60175f9 100644
--- a/Configuration/TCA/Overrides/sys_template.php
+++ b/Configuration/TCA/Overrides/sys_template.php
@@ -1,5 +1,5 @@
 <?php
-defined('TYPO3_MODE') || die();
+defined('TYPO3') || die();
 
 /**
  * Register Static Template
diff --git a/Configuration/TCA/Overrides/tt_content.php b/Configuration/TCA/Overrides/tt_content.php
index 4b0855e..04ecfbb 100644
--- a/Configuration/TCA/Overrides/tt_content.php
+++ b/Configuration/TCA/Overrides/tt_content.php
@@ -1,5 +1,5 @@
 <?php
-defined('TYPO3_MODE') || die();
+defined('TYPO3') || die();
 
 /**
  * Register Plugins
diff --git a/composer.json b/composer.json
index 3fd382e..c8f1d5d 100644
--- a/composer.json
+++ b/composer.json
@@ -14,8 +14,8 @@
   "type": "typo3-cms-extension",
   "license": "GPL-2.0-or-later",
   "require": {
-    "php": "^7.2",
-    "typo3/cms-core": "^10.4 || ^11.5",
+    "php": "^7.2 || ^8.0",
+    "typo3/cms-core": "^11.5",
     "ext-json": "*"
   },
   "autoload": {
diff --git a/ext_emconf.php b/ext_emconf.php
index 33458e5..7a43d92 100644
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -10,8 +10,8 @@
     'state' => 'stable',
     'constraints' => [
         'depends' => [
-            'typo3' => '10.4.0-11.5.99',
-            'php' => '7.2.0-7.99.99'
+            'typo3' => '11.5.0-11.5.99',
+            'php' => '7.2.0-8.1.99'
         ],
         'conflicts' => [],
         'suggests' => [],
diff --git a/ext_localconf.php b/ext_localconf.php
index 30985d5..ea4145b 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -1,6 +1,5 @@
 <?php
-
-if (!defined('TYPO3_MODE')) {
+if (!defined('TYPO3')) {
     die('Access denied.');
 }
 
@@ -20,7 +19,7 @@ function () {
         /**
          * Caching framework
          */
-        if (!is_array($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['instagram'])) {
+        if (!isset($GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['instagram'])) {
             $GLOBALS['TYPO3_CONF_VARS']['SYS']['caching']['cacheConfigurations']['instagram'] = [];
         }
 
diff --git a/ext_tables.php b/ext_tables.php
index 1f08934..7f24bed 100644
--- a/ext_tables.php
+++ b/ext_tables.php
@@ -1,5 +1,5 @@
 <?php
-defined('TYPO3_MODE') || die();
+defined('TYPO3') || die();
 
 call_user_func(
     function () {