The replacement has everything to do with the security vulnerabilities faced by SSL version 3.0 back in 2014. TLS (Transport Layer Security) is the successor and improved version of SSL. With its recent versions, there are many other improvements and performance benefits with TLS. All of the major web browsers have gotten rid of SSL in favor of TLS, and we expect this to be the case across the entirety of the world wide web in the years to come.