diff --git a/Classes/Hooks/GoogleMapHook.php b/Classes/Hooks/GoogleMapHook.php
index 1765445..4cb2c0b 100755
--- a/Classes/Hooks/GoogleMapHook.php
+++ b/Classes/Hooks/GoogleMapHook.php
@@ -14,6 +14,8 @@
  *
  * The TYPO3 project - inspiring people to share!
  */
+use TYPO3\CMS\Core\Configuration\ExtensionConfiguration;
+use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 /**
  * Google Map Hook
@@ -101,11 +103,11 @@ public function render($params, $fObj)
     {
         $this->init($params);
 
-        $extensionConfArr = unserialize($GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']['contacts']);
-        $googleMapsLibrary = $extensionConfArr['googleMapsLibrary'];
+        $googleMapsLibrary = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('contacts', 'googleMapsLibrary');
+        $googleMapsApiKey = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('contacts', 'googleMapsApiKey');
 
-        if ($extensionConfArr['googleMapsApiKey']) {
-            $googleMapsLibrary .=  '&key=' . $extensionConfArr['googleMapsApiKey'];
+        if ($googleMapsApiKey) {
+            $googleMapsLibrary .=  '&key=' . $googleMapsApiKey;
         }
 
         $this->tableName = $params['table'];
diff --git a/composer.json b/composer.json
index fd1f2ce..9b27509 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,8 @@
     },
     "require": {
         "php": ">=7.2.0 <7.3",
-        "typo3/cms-core": "^9.3"
+        "typo3/cms-core": "^9.3",
+        "typo3/cms-extbase": "^9.3"
     },
     "require-dev": {
         "nimut/testing-framework": "^4.0",