diff --git a/activitypub-event-bridge.php b/activitypub-event-bridge.php
index 1893a17..6cc1afb 100644
--- a/activitypub-event-bridge.php
+++ b/activitypub-event-bridge.php
@@ -11,7 +11,7 @@
  * License URI:  https://www.gnu.org/licenses/agpl-3.0.de.html
  * Requires PHP: 8.1
  *
- * Requires at least ActivityPub plugin with version >= 3.2.2. ActivityPub plugin tested up to: 3.3.3.
+ * Requires at least ActivityPub plugin with version >= 3.2.2. ActivityPub plugin tested up to: 4.0.1.
  *
  * @package ActivityPub_Event_Bridge
  * @license AGPL-3.0-or-later