Logo images redirection

Hello Folks!
We recently migrated the whole magento webshop to the https structure.

There comes the issue: The product pages are still unsecure, because each product logo is loaded from an unsecure source. Here is the Google Inspector insight:

Mixed Content: The page at ‘https://www.safegear.dk/birkegaarden-kodelas-lp-1230.html’ was loaded over HTTPS, but requested an insecure image ‘http://www.safegear.dk/media/brand/birkegaarden.gif’. This content should also be served over HTTPS.
The logo that is loaded over http is the one of “Birkegaarden”, in the top right.


Does anyone knows how to fix it?

Many thanks!