diff --git a/advanced_search.info.yml b/advanced_search.info.yml
index 11e8f24..60807c7 100644
--- a/advanced_search.info.yml
+++ b/advanced_search.info.yml
@@ -4,7 +4,7 @@ name: 'Advanced Search'
 description: "Creates an Advanced Search block and other enhancements to search."
 type: module
 package: Islandora
-core_version_requirement: ^8.8 || ^9 || ^10
+core_version_requirement: ^8.8 || ^9 || ^10 || ^11
 dependencies:
   - drupal:facets
   - drupal:facets_summary
diff --git a/src/EventSubscriber/PostConvertedQueryEventSubscriber.php b/src/EventSubscriber/PostConvertedQueryEventSubscriber.php
index 2781c69..f45479b 100644
--- a/src/EventSubscriber/PostConvertedQueryEventSubscriber.php
+++ b/src/EventSubscriber/PostConvertedQueryEventSubscriber.php
@@ -17,7 +17,7 @@ class PostConvertedQueryEventSubscriber implements EventSubscriberInterface {
   /**
    * {@inheritdoc}
    */
-  public static function getSubscribedEvents() {
+  public static function getSubscribedEvents(): array {
     $events[SearchAPISolrEvents::POST_CONVERT_QUERY][] = ['alter'];
 
     return $events;