Let’s Encrypt cuts certificate lifetimes to 64 days starting February 2027
Summary
Let’s Encrypt will reduce free SSL/TLS certificate lifetimes from 90 days to 64 days starting February 2027. The change emphasizes automation via ACME and ARI, with a testing window starting October 14, 2026 and guidance to audit renewal scripts to avoid downtime. The move aims to limit exposure from compromised or misissued certificates and hints at further reductions planned for 2028.