Here are the current system requirements for vBulletin Connect (Current Version 5.4.2)
Minimum Server Requirements
The following system requirements must be met to install vBulletin.
Apache 2, IIS 8.5, or Equivalent.
MySQL 5.5.8+ or MariaDB 10+
mod_rewrite, URL Rewrite or...
This script tests whether you meet the PHP requirements for XenForo 2.
Please note that this script does not confirm that you meet the minimum required
MySQL version (5.5). You must check that manually. If you are unsure where to
find this information, please contact your host.