If you share your website on Facebook, you may notice an older look in the image. While this is updated from time to time, you can do this yourself too:

  1. Save your template settings again. You'll have to make a small edit for the Save button to become available, such as changing a color and then changing it back again. 
  2. Go to https://developers.facebook.com/tools/debug/sharing/ and enter your URL (e.g. https://www.mycompany.com).
  3. Click on Debug, then click on Scrape again.
  4. Wait a few minutes, then repeat steps 2 and 3 to update your image.