diff --git a/db/update4.2.sql b/db/update4.2.sql
new file mode 100644
index 0000000000..b2b44b0cba
--- /dev/null
+++ b/db/update4.2.sql
@@ -0,0 +1 @@
+ALTER TABLE `zt_extension` ADD `depends` VARCHAR( 100 ) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL AFTER `installedTime` ;