diff --git a/Changelog b/Changelog
index dd01eda..3573606 100755
--- a/Changelog
+++ b/Changelog
@@ -1,3 +1,6 @@
+2020-04-30  Franz Holzinger <franz@ttproducts.de>
+    * compatibility for TYPO3 9: replace deprecated methods
+
 2019-12-20  Franz Holzinger <franz@ttproducts.de>
     * compatibility for TYPO3 9: transactor 0.8.0 now runs fully under TYPO3 9.5.
     * set compatibility = 0 to use the new API by default.
diff --git a/Classes/Domain/GatewayProxy.php b/Classes/Domain/GatewayProxy.php
index cb98aa3..80ad897 100755
--- a/Classes/Domain/GatewayProxy.php
+++ b/Classes/Domain/GatewayProxy.php
@@ -82,7 +82,7 @@ public function init ($extensionKey)
         ) {
             $this->gatewayClass = $this->extensionManagerConf['gatewayClass'];
         } else {
-            $composerFile = ExtensionManagementUtility::siteRelPath($extensionKey) . 'composer.json';
+            $composerFile = \TYPO3\CMS\Core\Utility\PathUtility::stripPathSitePrefix(ExtensionManagementUtility::extPath($extensionKey)) . 'composer.json';
             if (file_exists($composerFile)) {
                 $content = file_get_contents($composerFile);
                 $content = json_decode($content, true);
diff --git a/ext_emconf.php b/ext_emconf.php
index 68f5866..3c765a5 100755
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -8,7 +8,7 @@
     'title' => 'Payment Transactor API',
     'description' => 'This is a basic API to develop extensions which connect to different payment transaction gateways.',
     'category' => 'misc',
-    'version' => '0.8.0',
+    'version' => '0.8.1',
     'state' => 'stable',
     'uploadfolder' => 0,
     'createDirs' => '',
diff --git a/lib/class.tx_transactor_api.php b/lib/class.tx_transactor_api.php
index cb44008..35b25ec 100755
--- a/lib/class.tx_transactor_api.php
+++ b/lib/class.tx_transactor_api.php
@@ -148,7 +148,7 @@ static public function getGatewayProxyObject (
         $handleLib,
         $confScript
     ) {
-        GeneralUtility::requireOnce(ExtensionManagementUtility::extPath($handleLib) . 'model/class.tx_' . $handleLib . '_gatewayfactory.php');
+        require_once(ExtensionManagementUtility::extPath($handleLib) . 'model/class.tx_' . $handleLib . '_gatewayfactory.php');
 
         if (is_array($confScript)) {
             $gatewayExtKey = $confScript['extName'];