diff --git a/th_chat/discuz_plugin_th_chat.xml b/th_chat/discuz_plugin_th_chat.xml
index 691b8c5..4c89310 100644
--- a/th_chat/discuz_plugin_th_chat.xml
+++ b/th_chat/discuz_plugin_th_chat.xml
@@ -14,7 +14,7 @@
 			<item id="datatables"><![CDATA[]]></item>
 			<item id="directory"><![CDATA[th_chat/]]></item>
 			<item id="copyright"><![CDATA[newz]]></item>
-			<item id="version"><![CDATA[2.20b]]></item>
+			<item id="version"><![CDATA[2.21]]></item>
 			<item id="__modules">
 				<item id="0">
 					<item id="name"><![CDATA[chat]]></item>
diff --git a/th_chat/install.php b/th_chat/install.php
index e87d6ad..7df3639 100644
--- a/th_chat/install.php
+++ b/th_chat/install.php
@@ -12,7 +12,7 @@
 	`time` int(10) unsigned NOT NULL,
 	`ip` varchar(25) NOT NULL,
 	PRIMARY KEY  (`id`)
-) ENGINE=MyISAM  DEFAULT CHARSET=utf8mb4;");
+) ENGINE=InnoDB  DEFAULT CHARSET=utf8mb4;");
 DB::query("DROP TABLE IF EXISTS `".DB::table('newz_nick')."`;");
 DB::query("CREATE TABLE IF NOT EXISTS `".DB::table('newz_nick')."` (
 	`uid` mediumint(8) unsigned NOT NULL,
@@ -22,7 +22,7 @@
 	`sound_2` int(1) NOT NULL DEFAULT '1',
 	`ban` INT(10) UNSIGNED NOT NULL DEFAULT '0',
 	PRIMARY KEY (`uid`)
-) ENGINE=MyISAM DEFAULT CHARSET=utf8mb4;");
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;");
 DB::query("INSERT INTO `".DB::table('newz_data')."` (`uid`, `touid`, `icon`, `text`, `time`,`ip`) VALUES (1, 0, 'alert', 'ยินดีต้อนรับสู่ห้องแชท คุณสามารถเริ่มพิมพ์ข้อความของคุณได้ด้านล่างนี้~!', ".TIMESTAMP.", '".$_G['clientip']."');");
 $finish = TRUE;
 ?>
\ No newline at end of file
diff --git a/th_chat/upgrade.php b/th_chat/upgrade.php
index 06dc89f..512ae1e 100644
--- a/th_chat/upgrade.php
+++ b/th_chat/upgrade.php
@@ -34,9 +34,11 @@
 	runquery($sql);
 }
 
-if ($_GET['fromversion'] <= "2.20b") {
+if ($_GET['fromversion'] <= "2.21") {
 	DB::query("ALTER TABLE `pre_newz_data` RENAME `".DB::table('newz_data')."`;");
 	DB::query("ALTER TABLE `pre_newz_nick` RENAME `".DB::table('newz_nick')."`;");
+	DB::query("ALTER TABLE `".DB::table('newz_data')."` ENGINE=InnoDB;");
+	DB::query("ALTER TABLE `".DB::table('newz_nick')."` ENGINE=InnoDB;");
 }
 
 $finish = TRUE;