diff --git a/appinfo/info.xml b/appinfo/info.xml
index 6f05fb7..82ad4d5 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -46,6 +46,6 @@ See [README] for more exhaustive information on features and potential misfeatur
     <screenshot>https://github.com/e-alfred/epubreader/blob/master/screenshots/photo_2017-03-15_17-22-00.jpg?raw=true</screenshot>
     <screenshot>https://github.com/e-alfred/epubreader/blob/master/screenshots/photo_2017-03-15_17-22-02.jpg?raw=true</screenshot>
     <dependencies>
-        <nextcloud min-version="17" max-version="21"/>
+        <nextcloud min-version="17" max-version="22"/>
     </dependencies>
 </info>
diff --git a/lib/config.php b/lib/config.php
index 086b8fe..4f0474d 100644
--- a/lib/config.php
+++ b/lib/config.php
@@ -25,7 +25,7 @@ class Config
 	 * @return string retrieved value or default
 	 */
 	public static function get($key, $default) {
-		return \OC::$server->getConfig()->getUserValue(\OCP\User::getUser(), 'epubreader', $key, $default);
+		return \OC::$server->getConfig()->getUserValue(\OC_User::getUser(), 'epubreader', $key, $default);
 	}
 
 	/**
@@ -36,7 +36,7 @@ class Config
 	 * @return bool success
 	 */
 	public static function set($key, $value) {
-		return \OC::$server->getConfig()->setUserValue(\OCP\User::getUser(), 'epubreader', $key, $value);
+		return \OC::$server->getConfig()->setUserValue(\OC_User::getUser(), 'epubreader', $key, $value);
 	}
 
 	/**