how do you update FontAwesome version in mybb

in this theme there is no version link

{$stylesheets}
<link rel="stylesheet" href="{$mybb->settings['bburl']}/images/majestic/fonts/fa.css">
<link rel="alternate stylesheet" type="text/css" href="" title="red">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/green.css" title="green">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/blue.css" title="blue">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/yellow.css" title="yellow">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/orange.css" title="orange">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/navy.css" title="navy">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/purple.css" title="purple">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/teal.css" title="teal">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/brown.css" title="brown">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/grey.css" title="grey">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/pink.css" title="pink">
<link rel="alternate stylesheet" type="text/css" href="{$mybb->settings['bburl']}/images/majestic/patterns/cement.css" title="cement">