Subresource Integrity (SRI) enhances the security of using GitHub by ensuring that browsers verify the integrity of JavaScript and CSS files delivered by GitHub's Content Delivery Network (CDN), protecting against potential attacks from compromised CDNs. This security feature requires the use of modern browsers, such as Google Chrome, to function effectively. Although SRI contributes to making the web safer, its efficacy depends on websites implementing it, which GitHub has done and encourages others to follow. More detailed information on SRI and its adoption by GitHub can be found on the GitHub Engineering blog, as discussed by Ben Toews.