diff --git a/Classes/ResourceServer/GitLab.php b/Classes/ResourceServer/GitLab.php
index 062d165..a486dbc 100644
--- a/Classes/ResourceServer/GitLab.php
+++ b/Classes/ResourceServer/GitLab.php
@@ -146,7 +146,7 @@ public function loadUserDetails(ResourceOwnerInterface $user): void
         $gitlabClient = $user->getApiClient();
 
         try {
-            $project = $gitlabClient->projects->show($this->projectName);
+            $project = $gitlabClient->projects()->show($this->projectName);
 
             $accessLevel = 0;
             if (isset($project['permissions']['project_access'])) {
diff --git a/composer.json b/composer.json
index 50522e1..a5cb481 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
   "require": {
     "php": "^7.4||^8.0",
     "league/oauth2-client": "^2.6",
-    "m4tthumphrey/php-gitlab-api": "^9.19",
+    "m4tthumphrey/php-gitlab-api": "^11.0",
     "omines/oauth2-gitlab": "^3.4",
     "php-http/guzzle7-adapter": "^1.0",
     "psr/http-factory": "^1.0",
@@ -50,5 +50,11 @@
     "typo3/cms": {
       "extension-key": "oauth2"
     }
+  },
+  "config": {
+    "allow-plugins": {
+      "typo3/cms-composer-installers": false,
+      "typo3/class-alias-loader": false
+    }
   }
 }
diff --git a/ext_localconf.php b/ext_localconf.php
index b18e96e..9d00b7b 100644
--- a/ext_localconf.php
+++ b/ext_localconf.php
@@ -26,6 +26,10 @@
     $extensionConfig = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['oauth2']);
 } elseif (isset($GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['oauth2'])) {
     $extensionConfig = $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']['oauth2'];
+} else {
+    $extensionConfig = [
+        'enableBackendLogin' => false,
+    ];
 }
 
 if ($extensionConfig['enableBackendLogin']) {