diff --git a/common.php b/common.php
index 93eb219d..e5f37583 100644
--- a/common.php
+++ b/common.php
@@ -23,6 +23,7 @@
  * @copyright 2019 MyAAC
  * @link      https://my-aac.org
  */
+if (version_compare(phpversion(), '5.3.3', '<')) die('PHP version 5.3.3 or higher is required.');
 session_start();
 
 define('MYAAC', true);