diff --git a/Classes/Command/ExportCommand.php b/Classes/Command/ExportCommand.php
index 70754ac..9ea0ce4 100644
--- a/Classes/Command/ExportCommand.php
+++ b/Classes/Command/ExportCommand.php
@@ -10,6 +10,7 @@
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Style\SymfonyStyle;
 use Symfony\Component\Yaml\Yaml;
+use TYPO3\CMS\Core\Database\Connection;
 use TYPO3\CMS\Core\Database\ConnectionPool;
 use TYPO3\CMS\Core\Database\Query\Restriction\DeletedRestriction;
 use TYPO3\CMS\Core\Utility\GeneralUtility;
@@ -89,7 +90,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
 
         $yamlConfiguration = [];
         foreach (BeGroup::getAllowedFields() as $fieldName) {
-            $yamlConfiguration[$fieldName] = GeneralUtility::trimExplode(',', $group[$fieldName], true);
+            $yamlConfiguration[$fieldName] = GeneralUtility::trimExplode(',', $group[$fieldName] ?? '', true);
         }
 
         $yamlFileContents = Yaml::dump($yamlConfiguration, 99, 2);
@@ -139,9 +140,9 @@ protected function getGroupRecord($groupUid)
         $rows = $queryBuilder
             ->select('*')
             ->from('be_groups')
-            ->where($queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($groupUid, \PDO::PARAM_INT)))
-            ->execute()
-            ->fetch();
+            ->where($queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($groupUid, Connection::PARAM_INT)))
+            ->executeQuery()
+            ->fetchAssociative();
 
         return $rows;
     }
@@ -152,7 +153,7 @@ protected function updateGroupRecord($groupUid, $file)
         $queryBuilder
             ->update('be_groups')
             ->where(
-                $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($groupUid, \PDO::PARAM_INT))
+                $queryBuilder->expr()->eq('uid', $queryBuilder->createNamedParameter($groupUid, Connection::PARAM_INT))
             )
             ->set('tx_aclsfromhell_file', $file);
 
@@ -160,6 +161,6 @@ protected function updateGroupRecord($groupUid, $file)
             $queryBuilder->set($fieldName, null);
         }
 
-        $queryBuilder->execute();
+        $queryBuilder->executeStatement();
     }
 }
diff --git a/Classes/TceMain.php b/Classes/TceMain.php
index 1562b28..da85a1c 100644
--- a/Classes/TceMain.php
+++ b/Classes/TceMain.php
@@ -6,7 +6,7 @@
 
 class TceMain
 {
-    public function renderFiles(array &$config)
+    public function renderFiles(array &$config): void
     {
         if (empty($config['items'])) {
             $config['items'][] = ['', null];
diff --git a/composer.json b/composer.json
index 867681c..5ecd7f8 100644
--- a/composer.json
+++ b/composer.json
@@ -4,7 +4,8 @@
   "license": "MIT",
   "type": "typo3-cms-extension",
   "require": {
-    "typo3/cms-core": "^11.5 || ^12.4"
+    "php": "^8.3",
+    "typo3/cms-core": "^11.5 || ^12.4 || ^13.4"
   },
   "autoload": {
     "psr-4": {