Apple just released the Safari 14 update for Catalina and Mojave. You should be able to go into your Software Update for your Mac and install it. Here are some of the improvements in Safari 14:
Safari 14 includes a redesigned tab bar and a customizable start page, the removal of Adobe Flash support, a Privacy Report feature that focuses on cross-site tracking, along with various other improvements and security enhancements.
I especially like the removal of Adobe Flash support. Flash is a malware mess and needs to just go away.