Let's Encrypt "will shorten the default validity period of its TLS certificates from 90 days to 64 days, starting February 10, 2027," reports the blog Linuxiac: All certificates issued or renewed from that date will have a 64-day lifespan unless users explicitly select one of the shorter options already available: 45 or six days. Existing certificates will remain valid until their expiration dates. Let's Encrypt expects the final 90-day certificate to expire on May 11, 2027. The organization also confirmed no valid certificates will be revoked during the transition. To help administrators prepare, Let's Encrypt will introduce 64-day certificates in its staging environment on October 14, 2026, allowing users to test their renewal setups before the change reaches production. The move is part of a broader effort to improve web security by reducing how long compromised or incorrectly issued certificates remain usable... Looking further ahead, the organization plans to reduce the default certificate lifetime again, this time to 45 days in 2028. That makes the upcoming 64-day limit an intermediate step rather than the final destination. "Administrators using cron jobs or scripts with hardcoded renewal intervals should review their configurations," the article suggests. "Another upcoming change concerns domain validation. Let's Encrypt will reduce the period during which a previously completed domain authorization can be reused from 30 days to 10 days. In 2028, that period will shrink further to just seven hours."

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