diff --git a/db/init/init.sql b/db/init/init.sql
index f0442c7..26ed0f1 100644
--- a/db/init/init.sql
+++ b/db/init/init.sql
@@ -665,10 +665,81 @@ CREATE TABLE IF NOT EXISTS `user_remember_tokens` (
   CONSTRAINT `fk_user_remember_user` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
 
-INSERT INTO `tenants` (`uuid`, `description`, `created`)
-SELECT UUID(), 'MusterMandant', NOW()
+INSERT INTO `tenants` (
+  `uuid`,
+  `description`,
+  `address`,
+  `postal_code`,
+  `city`,
+  `country`,
+  `region`,
+  `vat_id`,
+  `tax_number`,
+  `phone`,
+  `fax`,
+  `email`,
+  `support_email`,
+  `support_phone`,
+  `billing_email`,
+  `website`,
+  `privacy_url`,
+  `imprint_url`,
+  `primary_color`,
+  `default_theme`,
+  `allow_user_theme`,
+  `status`,
+  `created`
+)
+SELECT
+  UUID(),
+  'MusterMandant',
+  'Musterstrasse 1',
+  '10115',
+  'Berlin',
+  'Deutschland',
+  'Berlin',
+  'DE123456789',
+  '12/345/67890',
+  '+49 30 12345670',
+  '+49 30 12345679',
+  'info@mustermandant.de',
+  'support@mustermandant.de',
+  '+49 30 12345671',
+  'billing@mustermandant.de',
+  'https://www.mustermandant.de',
+  'https://www.mustermandant.de/datenschutz',
+  'https://www.mustermandant.de/impressum',
+  '#1A73E8',
+  'light',
+  1,
+  'active',
+  NOW()
 WHERE NOT EXISTS (SELECT 1 FROM tenants WHERE description = 'MusterMandant');
 
+UPDATE `tenants`
+SET
+  `address` = COALESCE(`address`, 'Musterstrasse 1'),
+  `postal_code` = COALESCE(`postal_code`, '10115'),
+  `city` = COALESCE(`city`, 'Berlin'),
+  `country` = COALESCE(`country`, 'Deutschland'),
+  `region` = COALESCE(`region`, 'Berlin'),
+  `vat_id` = COALESCE(`vat_id`, 'DE123456789'),
+  `tax_number` = COALESCE(`tax_number`, '12/345/67890'),
+  `phone` = COALESCE(`phone`, '+49 30 12345670'),
+  `fax` = COALESCE(`fax`, '+49 30 12345679'),
+  `email` = COALESCE(`email`, 'info@mustermandant.de'),
+  `support_email` = COALESCE(`support_email`, 'support@mustermandant.de'),
+  `support_phone` = COALESCE(`support_phone`, '+49 30 12345671'),
+  `billing_email` = COALESCE(`billing_email`, 'billing@mustermandant.de'),
+  `website` = COALESCE(`website`, 'https://www.mustermandant.de'),
+  `privacy_url` = COALESCE(`privacy_url`, 'https://www.mustermandant.de/datenschutz'),
+  `imprint_url` = COALESCE(`imprint_url`, 'https://www.mustermandant.de/impressum'),
+  `primary_color` = COALESCE(`primary_color`, '#1A73E8'),
+  `default_theme` = COALESCE(`default_theme`, 'light'),
+  `allow_user_theme` = COALESCE(`allow_user_theme`, 1),
+  `status` = COALESCE(`status`, 'active')
+WHERE `description` = 'MusterMandant';
+
 INSERT INTO `departments` (`uuid`, `description`, `tenant_id`, `code`, `active`, `created`)
 SELECT UUID(), 'Musterabteilung', t.id, 'MUSTER', 1, NOW()
 FROM tenants t