Updating an CSS image so the change is consistent on the entire site.

Site URL: https://www.vpnconfiavel.com/comparacaovpn

Hello, 

I have this image/logo file i use throughout the entire site.  It is referenced in the CSS block by an address like: 

https://static1.squarespace.com/static/5a9e72bc4eddecded2210e98/t/.............jpg.

This logo has now changed, and I would like to update it on the entire site.  Is there a way to "replace" the current image file, so I don't have to make the change on every CSS block on the site?

Any help or recommendations would be greatly appreciated. 

Regards,

Jay