Breadcrumbs issues – data-vocabulary.org schema deprecated

Hi, I got a issue notification from google stating the following:

Search Console has identified that your site is affected by 1 Breadcrumbs issues: Top Warnings Warnings are suggestions for improvement. Some warnings can affect your appearance on Search; some might be reclassified as errors in the future. The following warnings were found on your site: data-vocabulary.org schema deprecated We recommend that you fix these issues when possible to enable the best experience and coverage in Google Search.

Looks like this is core to the theme itself. Can you please help me understand how I can fix this?