diff --git a/src/Middleware/SlowTaskNotifierMiddleware.php b/src/Middleware/SlowTaskNotifierMiddleware.php
new file mode 100644
index 00000000..0da6249a
--- /dev/null
+++ b/src/Middleware/SlowTaskNotifierMiddleware.php
@@ -0,0 +1,48 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SchedulerBundle\Middleware;
+
+use SchedulerBundle\Task\TaskInterface;
+use Symfony\Component\Mercure\HubInterface;
+use Symfony\Component\Mercure\Update;
+use Symfony\Component\Serializer\SerializerInterface;
+use function json_encode;
+
+/**
+ * @author Guillaume Loulier <contact@guillaumeloulier.fr>
+ */
+final class SlowTaskNotifierMiddleware implements PostExecutionMiddlewareInterface
+{
+    private HubInterface $hub;
+    private string $updateUrl;
+    private SerializerInterface $serializer;
+
+    public function __construct(
+        HubInterface $hub,
+        string $updateUrl,
+        SerializerInterface $serializer
+    ) {
+        $this->hub = $hub;
+        $this->updateUrl = $updateUrl;
+        $this->serializer = $serializer;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function postExecute(TaskInterface $task): void
+    {
+        if (!$this->hub instanceof HubInterface) {
+            return;
+        }
+
+        $this->hub->publish(new Update($this->updateUrl, json_encode([
+            'event' => 'task.slow_execution',
+            'body' => [
+                'task' => $this->serializer->serialize($task, 'json'),
+            ],
+        ])));
+    }
+}
diff --git a/tests/DependencyInjection/SchedulerBundleConfigurationTest.php b/tests/DependencyInjection/SchedulerBundleConfigurationTest.php
index d2d6f4c3..2d7bd543 100644
--- a/tests/DependencyInjection/SchedulerBundleConfigurationTest.php
+++ b/tests/DependencyInjection/SchedulerBundleConfigurationTest.php
@@ -24,6 +24,7 @@ public function testConfigurationCanBeEmpty(): void
         self::assertArrayHasKey('timezone', $configuration);
         self::assertArrayHasKey('tasks', $configuration);
         self::assertArrayNotHasKey('probe', $configuration);
+        self::assertArrayNotHasKey('notifier', $configuration);
         self::assertArrayHasKey('lock_store', $configuration);
     }
 
diff --git a/tests/Middleware/SlowTaskNotifierMiddlewareTest.php b/tests/Middleware/SlowTaskNotifierMiddlewareTest.php
new file mode 100644
index 00000000..efebb79b
--- /dev/null
+++ b/tests/Middleware/SlowTaskNotifierMiddlewareTest.php
@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\SchedulerBundle\Middleware;
+
+use PHPUnit\Framework\TestCase;
+
+/**
+ * @author Guillaume Loulier <contact@guillaumeloulier.fr>
+ */
+final class SlowTaskNotifierMiddlewareTest extends TestCase
+{
+}