Woocommerce Product Image Size in the sidebar

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Hi, The images of the woocommerce products ” featured, top rated” in the widgets in the sidebar are big : please see in the link www.pmvision.ca/shop/pmi-rmp-project-risk-management-professional/

When i update the theme to the latest version, the products in the sidebar widgets appear in 3 rows with small images, please see the link http://course.pmvision.ca/shop/managing-risk-in-primavera-risk-analysis-rel-8-7/

My question is how to update the theme with keeping the style without any changes. I like the big images in the sidebar. Is there a code to add to the style ?

I really appreciate any help as it is necessary to update the theme

Thanks a lot