I've been having some performance issues with my local WAMP install and saw a suggestion to move Apache to a different port. I achieved this by updating httpd.conf:

Listen 89
ServerName localhost:89

I also update my vhosts to use the new port:

<VirtualHost *:89> 
    ServerName mysite.local
    DocumentRoot "D:\wamp\www\mysite" 
</VirtualHost>

This works. I can now access the site via mysite.local:89. However, the site appears unstyled because the CSS and JS files are not linked properly. For example, the following CSS file cannot be found:

<link type="text/css" rel="stylesheet" href="http://mysite.local/sites/default/files/css/css_0-h4tIT-Kdty3gonMCX41fM-7MgTrV9BMd5XQoTqeaQ.css" media="all">

I need the CSS and JS to use mysite.local:89 instead of mysite.local. When I change this manually via the web inspector it works.

How can I change the CSS and JS imports to use the new port?