diff --git a/common.php b/common.php
index 3ea4681c..fa499419 100644
--- a/common.php
+++ b/common.php
@@ -27,7 +27,7 @@ if (version_compare(phpversion(), '8.1', '<')) die('PHP version 8.1 or higher is
 
 const MYAAC = true;
 const MYAAC_VERSION = '2.0-dev';
-const DATABASE_VERSION = 50;
+const DATABASE_VERSION = 51;
 const TABLE_PREFIX = 'myaac_';
 define('START_TIME', microtime(true));
 define('MYAAC_OS', stripos(PHP_OS, 'WIN') === 0 ? 'WINDOWS' : (strtoupper(PHP_OS) === 'DARWIN' ? 'MAC' : 'LINUX'));
diff --git a/system/migrations/51.php b/system/migrations/51.php
index b3d9bbc7..d6a78207 100644
--- a/system/migrations/51.php
+++ b/system/migrations/51.php
@@ -1 +1,36 @@
 <?php
+// 2fa
+// add the myaac_account_email_codes
+
+/**
+ * @var OTS_DB_MySQL $db
+ */
+
+$up = function () use ($db) {
+	if (!$db->hasColumn('accounts', '2fa_type')) {
+		$db->addColumn('accounts', '2fa_type', "tinyint NOT NULL DEFAULT 0 AFTER `web_flags`");
+	}
+
+	if (!$db->hasColumn('accounts', '2fa_secret')) {
+		$db->addColumn('accounts', '2fa_secret', "varchar(16) NOT NULL DEFAULT '' AFTER `2fa_type`");
+	}
+
+	// add myaac_account_email_codes table
+	if (!$db->hasTable(TABLE_PREFIX . 'account_email_codes')) {
+		$db->exec(file_get_contents(__DIR__ . '/46-account_email_codes.sql'));
+	}
+};
+
+$down = function () use ($db) {
+	if ($db->hasColumn('accounts', '2fa_type')) {
+		$db->dropColumn('accounts', '2fa_type');
+	}
+
+	if ($db->hasColumn('accounts', '2fa_secret')) {
+		$db->dropColumn('accounts', '2fa_secret');
+	}
+
+	if ($db->hasTable(TABLE_PREFIX . 'account_email_codes')) {
+		$db->dropTable(TABLE_PREFIX . 'account_email_codes');
+	}
+};