diff --git a/application/Espo/Core/Rebuild/Actions/GenerateInstanceId.php b/application/Espo/Core/Rebuild/Actions/GenerateInstanceId.php
new file mode 100644
index 0000000000..b6a5121f69
--- /dev/null
+++ b/application/Espo/Core/Rebuild/Actions/GenerateInstanceId.php
@@ -0,0 +1,57 @@
+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM - Open Source CRM application.
+ * Copyright (C) 2014-2023 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
+ * Website: https://www.espocrm.com
+ *
+ * EspoCRM is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * EspoCRM is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with EspoCRM. If not, see http://www.gnu.org/licenses/.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\Core\Rebuild\Actions;
+
+use Espo\Core\Rebuild\RebuildAction;
+use Espo\Core\Utils\Config;
+use Espo\Core\Utils\Util;
+
+/**
+ * @noinspection PhpUnused
+ */
+class GenerateInstanceId implements RebuildAction
+{
+    public function __construct(
+        private Config $config,
+        private Config\ConfigWriter $configWriter
+    ) {}
+
+    public function process(): void
+    {
+        if ($this->config->get('instanceId')) {
+            return;
+        }
+
+        $id = Util::generateUuid4();
+
+        $this->configWriter->set('instanceId', $id);
+        $this->configWriter->save();
+    }
+}
diff --git a/application/Espo/Resources/defaults/systemConfig.php b/application/Espo/Resources/defaults/systemConfig.php
index 01ba73c038..0e97738868 100644
--- a/application/Espo/Resources/defaults/systemConfig.php
+++ b/application/Espo/Resources/defaults/systemConfig.php
@@ -61,6 +61,7 @@ return [
         'apiSecretKeys',
         'hashSecretKey',
         'restrictedMode',
+        'instanceId',
         'adminUpgradeDisabled',
         'userLimit',
         'portalUserLimit',
diff --git a/application/Espo/Resources/metadata/app/rebuild.json b/application/Espo/Resources/metadata/app/rebuild.json
index 2a650febc3..5a6009d97e 100644
--- a/application/Espo/Resources/metadata/app/rebuild.json
+++ b/application/Espo/Resources/metadata/app/rebuild.json
@@ -4,6 +4,7 @@
         "Espo\\Core\\Rebuild\\Actions\\AddSystemData",
         "Espo\\Core\\Rebuild\\Actions\\CurrencyRates",
         "Espo\\Core\\Rebuild\\Actions\\ScheduledJobs",
-        "Espo\\Core\\Rebuild\\Actions\\ConfigMetadataCheck"
+        "Espo\\Core\\Rebuild\\Actions\\ConfigMetadataCheck",
+        "Espo\\Core\\Rebuild\\Actions\\GenerateInstanceId"
     ]
 }