diff --git a/th_chat/discuz_plugin_th_chat.xml b/th_chat/discuz_plugin_th_chat.xml
index 4a6012c..691b8c5 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[2.20]]></item>
+			<item id="version"><![CDATA[2.20b]]></item>
 			<item id="__modules">
 				<item id="0">
 					<item id="name"><![CDATA[chat]]></item>
diff --git a/th_chat/upgrade.php b/th_chat/upgrade.php
index b176dcc..06dc89f 100644
--- a/th_chat/upgrade.php
+++ b/th_chat/upgrade.php
@@ -34,5 +34,10 @@
 	runquery($sql);
 }
 
+if ($_GET['fromversion'] <= "2.20b") {
+	DB::query("ALTER TABLE `pre_newz_data` RENAME `".DB::table('newz_data')."`;");
+	DB::query("ALTER TABLE `pre_newz_nick` RENAME `".DB::table('newz_nick')."`;");
+}
+
 $finish = TRUE;
 ?>
\ No newline at end of file