My site are now HTTPS but WPMU email reports still show HTTP. How to fix this?

I recently added https to my sites, however when I get an email report from WPMU Dev my sites url still show http without the "s".
For example, when my site goes down I get the standard email warning:
"DOWN alert: http://mysite.com/ appears down"
shouldn't WPMU Dev system pick up that my site is now HTTPS? Shouldn't the email say:
"DOWN alert: https://mysite/ appears down".

So my question is how do I update this?