Updating WP 3.9.5 without destroying my website

Hi

I have a WP website version 3.9.5 that I want to update to the new version.

It was installed in 2014 so I have the folder themes: twentytwelve, twentythirteen, twentyfourteen, and the folder of the used theme ‘example-Theme’. All the files from ‘twentyfourteen’ where duplicated there, and made the edits on them.

If I update the wordpress website – Will it make any problems?