Let’s Encrypt Cuts Default Certificate Validity to 64 Days Ahead of 45-Day Switch

Starting February 10, 2027, Let’s Encrypt will issue certificates with a 64-day default validity, down from 90 days, ahead of the CA/Browser Forum’s 45-day switch. The last 90-day certificates are expected to expire in May 2027, and no valid certificates will be revoked during the transition.