ALTER TABLE `contacts` MODIFY `email` varchar(255) NOT NULL;
+TRUNCATE TABLE `messages`;
+
+-- Updates from version 0.5.1
+-- Updates from version 0.5.2
+-- Updates from version 0.5.3
+-- Updates from version 0.5.4
+
+ALTER TABLE `contacts` ADD `words` TEXT NULL AFTER `vcard`;
+ALTER TABLE `contacts` CHANGE `vcard` `vcard` LONGTEXT /*!40101 CHARACTER SET utf8 */ NULL DEFAULT NULL;
+ALTER TABLE `contactgroupmembers` ADD INDEX `contactgroupmembers_contact_index` (`contact_id`);
+
+TRUNCATE TABLE `messages`;
+TRUNCATE TABLE `cache`;