Site not secure

I’ve got a handful of Omeka sites that are showing me the “site not secure” message after being fine for months.
I don’t know how to fix this, has anyone else run into this problem or know how to fix it?

Here’s the hub site that leads to the rest of them.

This is not an Omeka issue. Your URL uses http, a protocol that modern browsers view as insecure. Try https instead: