diff --git a/SQL/mysql.initial.sql b/SQL/mysql.initial.sql
index 75b6d6331..1bc888458 100644
--- a/SQL/mysql.initial.sql
+++ b/SQL/mysql.initial.sql
@@ -10,7 +10,7 @@ CREATE TABLE `session` (
  `created` datetime NOT NULL DEFAULT '1000-01-01 00:00:00',
  `changed` datetime NOT NULL DEFAULT '1000-01-01 00:00:00',
  `ip` varchar(40) NOT NULL,
- `vars` text NOT NULL,
+ `vars` mediumtext NOT NULL,
  PRIMARY KEY(`sess_id`),
  INDEX `changed_index` (`changed`)
 ) /*!40000 ENGINE=INNODB */ /*!40101 CHARACTER SET utf8 COLLATE utf8_general_ci */;
diff --git a/SQL/mysql.update.sql b/SQL/mysql.update.sql
index 7091f30a0..729fd3c66 100644
--- a/SQL/mysql.update.sql
+++ b/SQL/mysql.update.sql
@@ -1,5 +1,5 @@
 -- RoundCube Webmail update script for MySQL databases
--- Updates from version 0.1-stable to 0.1.1
+-- Updates from version 0.1-stable to 0.3.1
 
 TRUNCATE TABLE `messages`;
 
@@ -51,3 +51,6 @@ ALTER TABLE `messages`
     ADD INDEX `index_index` (`user_id`, `cache_key`, `idx`);
 
 TRUNCATE `messages`;
+
+ALTER TABLE `session` 
+    CHANGE `vars` `vars` MEDIUMTEXT NOT NULL;