HTTPS Image Issue

Hi,

Is there a way to force the FTSE chart image to be delivered from an https source rather than from the current http source?

Website location: https://godhelpusall.com/finance-news

I know the image is available via https by testing it but cannot figure out a way to force the widget to do it.

Any help would be apreciated.

Thanks

Kevin

https://wordpress.org/plugins/ftse-chart/