How to apply og:image changes ?

Hi

i´m using Ultimate Facebook . I set up a specific og:image for a post at the post OpenGraph setting panel. I later changed the url of the image to pint to another but the changes are not applied. When I check the source code of the page, the old image is still present in the og:image place.

How to apply the changes when I replace og:image in the OpenGraph setting panel?

Thanks