diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index c8766dba..68fdcc3c 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+1.5.10 (Unreleased)
+----------------------
+- Fix #470: Fix obsolete notifications
+
 1.5.9 (March 14, 2024)
 ----------------------
 - Fix #443: Fix email subject on invite/add users
diff --git a/migrations/m240319_152508_fix_notification.php b/migrations/m240319_152508_fix_notification.php
new file mode 100644
index 00000000..07456a56
--- /dev/null
+++ b/migrations/m240319_152508_fix_notification.php
@@ -0,0 +1,34 @@
+<?php
+
+use humhub\components\Migration;
+use humhub\modules\notification\models\Notification;
+
+/**
+ * Class m240319_152508_fix_notification
+ */
+class m240319_152508_fix_notification extends Migration
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function safeUp()
+    {
+        Notification::updateAll(
+            ['class' => 'humhub\\modules\\calendar\\notifications\\ParticipantAdded'],
+            ['IN', 'class', [
+                'humhub\\modules\\calendar\\notifications\\Invited',
+                'humhub\\modules\\calendar\\notifications\\ForceAdd'
+            ]]
+        );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function safeDown()
+    {
+        echo "m240319_152508_fix_notification cannot be reverted.\n";
+
+        return false;
+    }
+}
diff --git a/module.json b/module.json
index 829aaa75..1e36b6b8 100644
--- a/module.json
+++ b/module.json
@@ -3,7 +3,7 @@
     "name": "Calendar",
     "description": "Create one-time or recurring events, invite and manage attendees, and keep track of all your events with the Calendar module.",
     "keywords": ["calendar"],
-    "version": "1.5.9",
+    "version": "1.5.10",
     "humhub": {
         "minVersion": "1.14"
     },