Testimonial Heading on Widget

I noticed on your screenshot for the widget testimonials that the Heading text seems to be slightly bolder than the Testimonial text. The heading seems to match the boldness of the client information at the bottom. However, on my widget the heading text matches the testimonial text and is not bold. The client info is bold, but not the heading. How can I fix this? I would really like the heading to be bold as it is in your screenshot.

Thanks.

https://wordpress.org/plugins/strong-testimonials/