diff --git a/install.sql b/install.sql
index cf3930c..b91e545 100644
--- a/install.sql
+++ b/install.sql
@@ -26,7 +26,7 @@ CREATE TABLE `message` (
   `id` int NOT NULL AUTO_INCREMENT,
   `title` varchar(255) DEFAULT NULL,
   `content` longtext,
-  `updated_at` timestamp NOT NULL ON UPDATE CURRENT_TIMESTAMP,
+  `updated_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
   `created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
   PRIMARY KEY (`id`)
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;