diff --git a/sql/mysql/upgrade/2.99.3/authentication_sources.sql b/sql/mysql/upgrade/2.99.3/authentication_sources.sql
new file mode 100644
index 0000000..b282ff4
--- /dev/null
+++ b/sql/mysql/upgrade/2.99.3/authentication_sources.sql
@@ -0,0 +1,25 @@
+SET FOREIGN_KEY_CHECKS=0;
+
+ALTER TABLE `users` ADD COLUMN `authentication_details` varchar(255) default NULL;
+ALTER TABLE `users` ADD COLUMN `authentication_source_id` int(11) default NULL;
+ALTER TABLE `users` ADD INDEX `authentication_source` (`authentication_source_id`);
+ALTER TABLE `users` ADD CONSTRAINT `users_ibfk_1` FOREIGN KEY (`authentication_source_id`) REFERENCES `authentication_sources` (`id`) ON DELETE SET NULL;
+
+CREATE TABLE `authentication_sources` (
+  `id` int(11) NOT NULL default '0',
+  `name` varchar(50) NOT NULL default '',
+  `namespace` varchar(255) NOT NULL default '',
+  `authentication_provider` varchar(255) NOT NULL default '',
+  `config` text NOT NULL,
+  `is_user_source` tinyint(1) NOT NULL default '0',
+  `is_group_source` tinyint(1) NOT NULL default '0',
+  PRIMARY KEY  (`id`),
+  KEY `namespace` (`namespace`)
+) ENGINE=InnoDB;
+
+CREATE TABLE `zseq_authentication_sources` (
+  `id` int(10) unsigned NOT NULL auto_increment,
+  PRIMARY KEY  (`id`)
+) ENGINE=MyISAM;
+
+SET FOREIGN_KEY_CHECKS=1;