diff --git a/VERSION.txt b/VERSION.txt
index bd097b3f5b32..ee46351da47b 100644
--- a/VERSION.txt
+++ b/VERSION.txt
@@ -1 +1 @@
-5.5.28
\ No newline at end of file
+5.5.29
\ No newline at end of file
diff --git a/app/Notifications/Ninja/DomainRenewalFailureNotification.php b/app/Notifications/Ninja/DomainRenewalFailureNotification.php
new file mode 100644
index 000000000000..44eb7255e5ec
--- /dev/null
+++ b/app/Notifications/Ninja/DomainRenewalFailureNotification.php
@@ -0,0 +1,86 @@
+<?php
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2022. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://www.elastic.co/licensing/elastic-license
+ */
+
+namespace App\Notifications\Ninja;
+
+use App\Models\Account;
+use App\Models\Client;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Messages\SlackMessage;
+use Illuminate\Notifications\Notification;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+
+class DomainRenewalFailureNotification extends Notification 
+{
+
+    /**
+     * Create a new notification instance.
+     *
+     * @return void
+     */
+
+    protected string $domain;
+
+    public function __construct(string $domain)
+    {
+        $this->domain = $domain;
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @param  mixed  $notifiable
+     * @return array
+     */
+    public function via($notifiable)
+    {
+        return ['slack'];
+    }
+
+    /**
+     * Get the mail representation of the notification.
+     *
+     * @param  mixed  $notifiable
+     * @return MailMessage
+     */
+    public function toMail($notifiable)
+    {
+    }
+
+    /**
+     * Get the array representation of the notification.
+     *
+     * @param  mixed  $notifiable
+     * @return array
+     */
+    public function toArray($notifiable)
+    {
+        return [
+            //
+        ];
+    }
+
+    public function toSlack($notifiable)
+    {
+        $content = "Domain Certificate _renewal_ failure:\n";
+        $content .= "{$this->domain}\n";        
+
+        return (new SlackMessage)
+                ->success()
+                ->from(ctrans('texts.notification_bot'))
+                ->image('https://app.invoiceninja.com/favicon.png')
+                ->content($content);
+    }
+}
diff --git a/config/ninja.php b/config/ninja.php
index cd87907d3913..de1fd38ad08e 100644
--- a/config/ninja.php
+++ b/config/ninja.php
@@ -14,8 +14,8 @@ return [
     'require_https' => env('REQUIRE_HTTPS', true),
     'app_url' => rtrim(env('APP_URL', ''), '/'),
     'app_domain' => env('APP_DOMAIN', 'invoicing.co'),
-    'app_version' => '5.5.28',
-    'app_tag' => '5.5.28',
+    'app_version' => '5.5.29',
+    'app_tag' => '5.5.29',
     'minimum_client_version' => '5.0.16',
     'terms_version' => '1.0.1',
     'api_secret' => env('API_SECRET', ''),
diff --git a/database/migrations/2022_10_07_065455_add_key_to_company_tokens_table.php b/database/migrations/2022_10_07_065455_add_key_to_company_tokens_table.php
new file mode 100644
index 000000000000..4811e76d33f1
--- /dev/null
+++ b/database/migrations/2022_10_07_065455_add_key_to_company_tokens_table.php
@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        Schema::table('company_tokens', function (Blueprint $table) {
+            $table->index('token');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+
+    }
+};