diff --git a/store/db/mysql/migration/dev/LATEST__SCHEMA.sql b/store/db/mysql/migration/dev/LATEST__SCHEMA.sql
index 605fe945..e9f9551a 100644
--- a/store/db/mysql/migration/dev/LATEST__SCHEMA.sql
+++ b/store/db/mysql/migration/dev/LATEST__SCHEMA.sql
@@ -22,7 +22,7 @@ CREATE TABLE `migration_history` (
 -- system_setting
 CREATE TABLE `system_setting` (
   `name` VARCHAR(255) NOT NULL PRIMARY KEY,
-  `value` TEXT NOT NULL,
+  `value` LONGTEXT NOT NULL,
   `description` TEXT NOT NULL
 );
 
@@ -37,14 +37,14 @@ CREATE TABLE `user` (
   `email` VARCHAR(255) NOT NULL DEFAULT '',
   `nickname` VARCHAR(255) NOT NULL DEFAULT '',
   `password_hash` VARCHAR(255) NOT NULL,
-  `avatar_url` TEXT NOT NULL
+  `avatar_url` LONGTEXT NOT NULL
 );
 
 -- user_setting
 CREATE TABLE `user_setting` (
   `user_id` INT NOT NULL,
   `key` VARCHAR(255) NOT NULL,
-  `value` TEXT NOT NULL,
+  `value` LONGTEXT NOT NULL,
   UNIQUE(`user_id`,`key`)
 );
 
diff --git a/store/db/mysql/migration/prod/0.18/00__extend_text.sql b/store/db/mysql/migration/prod/0.18/00__extend_text.sql
new file mode 100644
index 00000000..21f3bcbd
--- /dev/null
+++ b/store/db/mysql/migration/prod/0.18/00__extend_text.sql
@@ -0,0 +1,3 @@
+ALTER TABLE `system_setting` MODIFY `value` LONGTEXT NOT NULL;
+ALTER TABLE `user_setting` MODIFY `value` LONGTEXT NOT NULL;
+ALTER TABLE `user` MODIFY `avatar_url` LONGTEXT NOT NULL;
diff --git a/store/db/mysql/migration/prod/LATEST__SCHEMA.sql b/store/db/mysql/migration/prod/LATEST__SCHEMA.sql
index 74767c3a..005595bc 100644
--- a/store/db/mysql/migration/prod/LATEST__SCHEMA.sql
+++ b/store/db/mysql/migration/prod/LATEST__SCHEMA.sql
@@ -22,7 +22,7 @@ CREATE TABLE `migration_history` (
 -- system_setting
 CREATE TABLE `system_setting` (
   `name` VARCHAR(255) NOT NULL PRIMARY KEY,
-  `value` TEXT NOT NULL,
+  `value` LONGTEXT NOT NULL,
   `description` TEXT NOT NULL
 );
 
@@ -37,14 +37,14 @@ CREATE TABLE `user` (
   `email` VARCHAR(255) NOT NULL DEFAULT '',
   `nickname` VARCHAR(255) NOT NULL DEFAULT '',
   `password_hash` VARCHAR(255) NOT NULL,
-  `avatar_url` TEXT NOT NULL
+  `avatar_url` LONGTEXT NOT NULL
 );
 
 -- user_setting
 CREATE TABLE `user_setting` (
   `user_id` INT NOT NULL,
   `key` VARCHAR(255) NOT NULL,
-  `value` TEXT NOT NULL,
+  `value` LONGTEXT NOT NULL,
   UNIQUE(`user_id`,`key`)
 );