On Thursday, August 9 the IETF published TLS 1.3 as an approved standard, following its publication as a proposal in March 2018. TLS 1.3 offers important improvements in both security and connection speed, and adoption among software and service vendors is already well underway, including support in Chrome, Firefox, and Cloudflare.
We would like to take this opportunity to remind certificate holders that no action is required on their part for their active certificates to work with TLS 1.3. If both parties in the transaction support TLS 1.3, they will use the new protocol automatically. If one or more does not, they will drop back to an older protocol (most likely TLS 1.2).
Either way, the exact same TLS certificate will work just fine. There is no need to replace or reinstall any of your certificates.