diff --git a/lib/private/EventDispatcher/EventDispatcher.php b/lib/private/EventDispatcher/EventDispatcher.php
index b81b474130..f2a87cc4c7 100644
--- a/lib/private/EventDispatcher/EventDispatcher.php
+++ b/lib/private/EventDispatcher/EventDispatcher.php
@@ -100,6 +100,7 @@ class EventDispatcher implements IEventDispatcher {
 
 	/**
 	 * @return SymfonyDispatcher
+	 * @deprecated 20.0.0
 	 */
 	public function getSymfonyDispatcher(): SymfonyDispatcher {
 		return $this->dispatcher;
diff --git a/lib/private/EventDispatcher/SymfonyAdapter.php b/lib/private/EventDispatcher/SymfonyAdapter.php
index f2b74a5ca6..454f4ca4b0 100644
--- a/lib/private/EventDispatcher/SymfonyAdapter.php
+++ b/lib/private/EventDispatcher/SymfonyAdapter.php
@@ -35,6 +35,9 @@ use OCP\ILogger;
 use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 
+/**
+ * @deprecated 20.0.0 use \OCP\EventDispatcher\IEventDispatcher
+ */
 class SymfonyAdapter implements EventDispatcherInterface {
 
 	/** @var EventDispatcher */
@@ -42,6 +45,9 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	/** @var ILogger */
 	private $logger;
 
+	/**
+	 * @deprecated 20.0.0
+	 */
 	public function __construct(EventDispatcher $eventDispatcher, ILogger $logger) {
 		$this->eventDispatcher = $eventDispatcher;
 		$this->logger = $logger;
@@ -57,6 +63,7 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 *                              If not supplied, an empty Event instance is created
 	 *
 	 * @return void
+	 * @deprecated 20.0.0
 	 */
 	public function dispatch($eventName, $event = null) {
 		// type hinting is not possible, due to usage of GenericEvent
@@ -85,6 +92,7 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 * @param callable $listener The listener
 	 * @param int $priority The higher this value, the earlier an event
 	 *                            listener will be triggered in the chain (defaults to 0)
+	 * @deprecated 20.0.0
 	 */
 	public function addListener($eventName, $listener, $priority = 0) {
 		if (is_callable($listener)) {
@@ -100,6 +108,7 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 *
 	 * The subscriber is asked for all the events it is
 	 * interested in and added as a listener for these events.
+	 * @deprecated 20.0.0
 	 */
 	public function addSubscriber(EventSubscriberInterface $subscriber) {
 		$this->eventDispatcher->getSymfonyDispatcher()->addSubscriber($subscriber);
@@ -110,11 +119,15 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 *
 	 * @param string $eventName The event to remove a listener from
 	 * @param callable $listener The listener to remove
+	 * @deprecated 20.0.0
 	 */
 	public function removeListener($eventName, $listener) {
 		$this->eventDispatcher->getSymfonyDispatcher()->removeListener($eventName, $listener);
 	}
 
+	/**
+	 * @deprecated 20.0.0
+	 */
 	public function removeSubscriber(EventSubscriberInterface $subscriber) {
 		$this->eventDispatcher->getSymfonyDispatcher()->removeSubscriber($subscriber);
 	}
@@ -125,6 +138,7 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 * @param string|null $eventName The name of the event
 	 *
 	 * @return array The event listeners for the specified event, or all event listeners by event name
+	 * @deprecated 20.0.0
 	 */
 	public function getListeners($eventName = null) {
 		return $this->eventDispatcher->getSymfonyDispatcher()->getListeners($eventName);
@@ -139,6 +153,7 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 * @param callable $listener The listener
 	 *
 	 * @return int|null The event listener priority
+	 * @deprecated 20.0.0
 	 */
 	public function getListenerPriority($eventName, $listener) {
 		return $this->eventDispatcher->getSymfonyDispatcher()->getListenerPriority($eventName, $listener);
@@ -150,6 +165,7 @@ class SymfonyAdapter implements EventDispatcherInterface {
 	 * @param string|null $eventName The name of the event
 	 *
 	 * @return bool true if the specified event has any listeners, false otherwise
+	 * @deprecated 20.0.0
 	 */
 	public function hasListeners($eventName = null) {
 		return $this->eventDispatcher->getSymfonyDispatcher()->hasListeners($eventName);