diff --git a/composer.json b/composer.json
index 28c38666..aefecf50 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         "source": "https://git.drupalcode.org/project/rules"
     },
     "require": {
-        "drupal/core": "^9 || ^10",
+        "drupal/core": "^9.1 || ^10",
         "drupal/typed_data": "^1.0"
     },
     "minimum-stability": "dev",
diff --git a/rules.info.yml b/rules.info.yml
index 10bd719c..f9fb2372 100644
--- a/rules.info.yml
+++ b/rules.info.yml
@@ -2,7 +2,7 @@ name: Rules
 type: module
 description: 'React on events and conditionally evaluate actions.'
 package: Rules
-core_version_requirement: ^9 || ^10
+core_version_requirement: ^9.1 || ^10
 dependencies:
   - drupal:config
   - typed_data:typed_data
diff --git a/src/Core/RulesConfigurableEventHandlerInterface.php b/src/Core/RulesConfigurableEventHandlerInterface.php
index c2e1d2ab..2158a569 100644
--- a/src/Core/RulesConfigurableEventHandlerInterface.php
+++ b/src/Core/RulesConfigurableEventHandlerInterface.php
@@ -4,7 +4,6 @@ namespace Drupal\rules\Core;
 
 use Drupal\Component\Plugin\ConfigurableInterface;
 use Drupal\Core\Form\FormStateInterface;
-use Symfony\Component\EventDispatcher\Event;
 
 /**
  * Interface for handling configurable rules events.
@@ -29,8 +28,13 @@ interface RulesConfigurableEventHandlerInterface extends RulesEventHandlerInterf
   /**
    * Determines the qualified event names for the dispatched event.
    *
-   * @param \Symfony\Component\EventDispatcher\Event $event
+   * @todo The 'object' type hint should be replaced with the appropriate
+   * class once Symfony 4 is no longer supported.
+   *
+   * @param object $event
    *   The event data of the event being dispatched.
+   *   In Drupal 9 this will be a \Symfony\Component\EventDispatcher\Event,
+   *   In Drupal 10 this will be a \Symfony\Contracts\EventDispatcher\Event.
    * @param string $event_name
    *   The event base name.
    * @param array $event_definition
@@ -42,7 +46,7 @@ interface RulesConfigurableEventHandlerInterface extends RulesEventHandlerInterf
    *   the fully-qualified event "rules_entity_view:node--article" should be
    *   triggered in addition to base event "rules_entity_view:node".
    */
-  public static function determineQualifiedEvents(Event $event, $event_name, array &$event_definition);
+  public static function determineQualifiedEvents(object $event, $event_name, array &$event_definition);
 
   /**
    * Provides a human readable summary of the event's configuration.
diff --git a/src/EventHandler/ConfigurableEventHandlerEntityBundle.php b/src/EventHandler/ConfigurableEventHandlerEntityBundle.php
index 0174f168..fd93a58d 100644
--- a/src/EventHandler/ConfigurableEventHandlerEntityBundle.php
+++ b/src/EventHandler/ConfigurableEventHandlerEntityBundle.php
@@ -4,7 +4,6 @@ namespace Drupal\rules\EventHandler;
 
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\rules\Event\EntityEvent;
-use Symfony\Component\EventDispatcher\Event;
 
 /**
  * Exposes the bundle of an entity as event setting.
@@ -14,7 +13,9 @@ class ConfigurableEventHandlerEntityBundle extends ConfigurableEventHandlerBase
   /**
    * {@inheritdoc}
    */
-  public static function determineQualifiedEvents(Event $event, $event_name, array &$event_definition) {
+  public static function determineQualifiedEvents(object $event, $event_name, array &$event_definition) {
+    // @todo The 'object' type hint should be replaced with the appropriate
+    // class once Symfony 4 is no longer supported.
     $events_suffixes = [];
     if ($event instanceof EntityEvent) {
       $events_suffixes[] = $event->getSubject()->bundle();
diff --git a/src/EventSubscriber/GenericEventSubscriber.php b/src/EventSubscriber/GenericEventSubscriber.php
index 9b67687b..e30026dd 100644
--- a/src/EventSubscriber/GenericEventSubscriber.php
+++ b/src/EventSubscriber/GenericEventSubscriber.php
@@ -8,9 +8,10 @@ use Drupal\rules\Context\ExecutionState;
 use Drupal\rules\Core\RulesConfigurableEventHandlerInterface;
 use Drupal\rules\Core\RulesEventManager;
 use Drupal\rules\Engine\RulesComponentRepositoryInterface;
-use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\EventDispatcher\GenericEvent;
+use Symfony\Component\EventDispatcher\Event as SymfonyComponentEvent;
+use Symfony\Contracts\EventDispatcher\Event as SymfonyContractsEvent;
 
 /**
  * Subscribes to Symfony events and maps them to Rules events.
@@ -97,12 +98,22 @@ class GenericEventSubscriber implements EventSubscriberInterface {
   /**
    * Reacts on the given event and invokes configured reaction rules.
    *
-   * @param \Symfony\Component\EventDispatcher\Event $event
+   * @param object $event
    *   The event object containing context for the event.
+   *   In Drupal 9 this will be a \Symfony\Component\EventDispatcher\Event,
+   *   In Drupal 10 this will be a \Symfony\Contracts\EventDispatcher\Event.
    * @param string $event_name
    *   The event name.
    */
-  public function onRulesEvent(Event $event, $event_name) {
+  public function onRulesEvent(object $event, $event_name) {
+    // @todo The 'object' type hint should be replaced with the appropriate
+    // class once Symfony 4 is no longer supported, and the assert() should be
+    // removed.
+    assert(
+      $event instanceof SymfonyComponentEvent ||
+      $event instanceof SymfonyContractsEvent
+    );
+
     // Get event metadata and the to-be-triggered events.
     $event_definition = $this->eventManager->getDefinition($event_name);
     $handler_class = $event_definition['class'];