Most major web browsers such as Google Chrome, Mozilla Firefox, Apple Safari, and Microsoft Edge and Internet Explorer should already be using TLS 1.2 (Transport Layer Security protocol) if the latest versions are installed.

Windows devices can be updated by selecting Control Panel -> Network and Internet -> Internet Options.  Under the Advanced tab, TLS 1.0 and TLS 1.1 should be unchecked.

To verify if your browser meets TLS 1.2 security requirements, you can access these links:  www.ssllabs.com/ssltest/viewMyClient.html and www.howsmyssl.com

Websites and servers that have not recently been updated may still be running TLS versions 1.0 and 1.1, so web browsers and apps may display error messages or block access to them.

TLS 1.3 is currently the latest version, which was published by the Internet Engineering Task Force (IETF) in August 2018.