diff --git a/appinfo/app.php b/appinfo/app.php
deleted file mode 100644
index a7344ee..0000000
--- a/appinfo/app.php
+++ /dev/null
@@ -1,32 +0,0 @@
-<?php
-
-namespace OCA\Files_MindMap\AppInfo;
-
-use OC\Security\CSP\ContentSecurityPolicy;
-
-$eventDispatcher = \OC::$server->getEventDispatcher();
-
-if (\OC::$server->getUserSession()->isLoggedIn()) {
-    $eventDispatcher->addListener('OCA\Files::loadAdditionalScripts', function() {
-        \OCP\Util::addStyle('files_mindmap', 'style');
-        \OCP\Util::addScript('files_mindmap', 'jszip');
-        \OCP\Util::addScript('files_mindmap', 'mindmap');
-    });
-}
-
-
-$eventDispatcher->addListener('OCA\Files_Sharing::loadAdditionalScripts', function () {
-    \OCP\Util::addStyle('files_mindmap', 'style');
-    \OCP\Util::addScript('files_mindmap', 'jszip');
-    \OCP\Util::addScript('files_mindmap', 'mindmap');
-});
-
-
-$cspManager = \OC::$server->getContentSecurityPolicyManager();
-$csp = new ContentSecurityPolicy();
-$csp->addAllowedChildSrcDomain("'self'");
-$csp->addAllowedFrameDomain("data:");
-$cspManager->addDefaultPolicy($csp);
-
-$app = new Application();
-$app->registerProvider();
\ No newline at end of file
diff --git a/appinfo/info.xml b/appinfo/info.xml
index 885a222..5a5c902 100644
--- a/appinfo/info.xml
+++ b/appinfo/info.xml
@@ -18,7 +18,7 @@
 	<screenshot small-thumbnail="https://raw.githubusercontent.com/ACTom/files_mindmap/master/screenshots/2-small.png">https://raw.githubusercontent.com/ACTom/files_mindmap/master/screenshots/2.png</screenshot>
 	<screenshot small-thumbnail="https://raw.githubusercontent.com/ACTom/files_mindmap/master/screenshots/3-small.png">https://raw.githubusercontent.com/ACTom/files_mindmap/master/screenshots/3.png</screenshot>
 	<dependencies>
-		<nextcloud min-version="14" max-version="27"/>
+		<nextcloud min-version="20" max-version="27"/>
 	</dependencies>
 	<repair-steps>
 		<install>
diff --git a/lib/AppInfo/Application.php b/lib/AppInfo/Application.php
index 1f1f920..78fc80b 100644
--- a/lib/AppInfo/Application.php
+++ b/lib/AppInfo/Application.php
@@ -3,23 +3,57 @@
 namespace OCA\Files_MindMap\AppInfo;
 
 use OC\Files\Type\Detection;
+use OCA\Files\Event\LoadAdditionalScriptsEvent;
+use OCA\Files_MindMap\Listener\LoadAdditionalScripts;
 use OCP\AppFramework\App;
+use OCP\AppFramework\Bootstrap\IBootContext;
+use OCP\AppFramework\Bootstrap\IBootstrap;
+use OCP\AppFramework\Bootstrap\IRegistrationContext;
+use OCP\AppFramework\Http\ContentSecurityPolicy;
+use OCP\EventDispatcher\IEventDispatcher;
+use OCP\Files\IMimeTypeDetector;
+use OCP\Security\CSP\AddContentSecurityPolicyEvent;
 
-class Application extends App {
+
+class Application extends App implements IBootstrap {
     const APPNAME = 'files_mindmap';
 
 	public function __construct(array $urlParams = array()) {
 		parent::__construct(self::APPNAME, $urlParams);
     }
-    
+
 
 	public function registerProvider() {
 		$container = $this->getContainer();
 
 		// Register mimetypes
 		/** @var Detection $detector */
-		$detector = $container->query(\OCP\Files\IMimeTypeDetector::class);
+		$detector = $container->get(IMimeTypeDetector::class);
 		$detector->getAllMappings();
 		$detector->registerType('km','application/km');
 	}
-}
\ No newline at end of file
+
+	public function register(IRegistrationContext $context): void {
+
+		$context->registerEventListener(
+			LoadAdditionalScriptsEvent::class,
+			LoadAdditionalScripts::class
+		);
+	}
+
+	public function boot(IBootContext $context): void {
+		$this->registerProvider();
+
+		$context->injectFn([$this, 'registerEventsSecurity']);
+	}
+
+	public function registerEventsSecurity(IEventDispatcher $dispatcher): void {
+		$dispatcher->addListener(AddContentSecurityPolicyEvent::class, function (AddContentSecurityPolicyEvent $e) {
+			$policy = new ContentSecurityPolicy();
+			$policy->addAllowedChildSrcDomain("'self'");
+			$policy->addAllowedFrameDomain("data:");
+			$e->addPolicy($policy);
+		});
+
+	}
+}
diff --git a/lib/Listener/LoadAdditionalScripts.php b/lib/Listener/LoadAdditionalScripts.php
new file mode 100644
index 0000000..5f944b3
--- /dev/null
+++ b/lib/Listener/LoadAdditionalScripts.php
@@ -0,0 +1,23 @@
+<?php
+
+declare(strict_types=1);
+
+namespace OCA\Files_MindMap\Listener;
+
+use OCA\Files_MindMap\AppInfo\Application;
+use OCA\Files\Event\LoadAdditionalScriptsEvent;
+use OCP\EventDispatcher\Event;
+use OCP\EventDispatcher\IEventListener;
+use OCP\Util;
+
+class LoadAdditionalScripts implements IEventListener {
+	public function handle(Event $event): void {
+		if (!($event instanceof LoadAdditionalScriptsEvent)) {
+			return;
+		}
+
+		Util::addStyle(Application::APPNAME, 'style');
+		Util::addScript(Application::APPNAME, 'jszip');
+		Util::addScript(Application::APPNAME, 'mindmap');
+	}
+}