{"rewrite":{"id":"r_ea93f334237ed513b3a1713d","clusterId":"c_3d4ad00d11153787afbd3666","slug":"let-s-encrypt-will-cut-certificate-validity-to-64-days-in-february-2027","model":"deepseek-v4-1-flash","headline":"Let's Encrypt Will Cut Certificate Validity To 64 Days In February 2027","summary":"Let's Encrypt will shorten its SSL/TLS certificate validity period from 90 days to 64 days starting February 10, 2027. Testing of the shortened certificates begins October 14, 2026, and administrators can join before production deployment. A further cut to 45 days is set for February 16, 2028. Renewal timing values such as 60 and 80 days will need adjusting, and the reuse window for authentication results drops from 30 days to 10 days.","whyItMatters":"The staged shortening gives administrators a test window in October 2026, but any setup that renews on a fixed schedule rather than through an ACME client with renewal notifications has roughly a year to fix its scripts before certificates start expiring early.","webCardHtml":"\u003cp\u003eLet\u0026#39;s Encrypt will cut its certificate validity period from 90 days to 64 days on February 10, 2027, with a further reduction to 45 days planned for February 16, 2028. Testing of the 64-day certificates starts October 14, 2026, so administrators can try the shorter window in their own environments before it reaches production.\u003c/p\u003e\u003cp\u003eThe change follows the CA/Browser Forum\u0026#39;s push to shorten certificate lifetimes. Let\u0026#39;s Encrypt recommends moving renewal timing values such as 60 and 80 days to match the new period, checking whether the ACME client supports renewal notifications, and confirming that expiration alerts are configured. Authentication results will also be reusable for 10 days instead of 30, with a further cut planned in 2028.\u003c/p\u003e","blueskyPost":"Let's Encrypt's 45-day cut in 2028 matters more than the 64-day one: clients that hardcode 90-day renewal checks will keep breaking as the gap shrinks.","twitterPost":"Let's Encrypt's 2028 drop to 45 days makes the 64-day cut a staging point, not the destination. Renewal logic has to become dynamic.","threadsPost":"The 64-day limit for Let's Encrypt lands in 2027, but the 45-day cut in 2028 is what breaks things. Renewal automation built around 90 days will need to recalculate each time the window shrinks, and the reuse window dropping to 10 days removes the slack that hid timing bugs.","newsletterBlurb":"Let's Encrypt will shorten certificate validity from 90 days to 64 days on February 10, 2027, with a further cut to 45 days set for February 16, 2028. Testing of the 64-day certificates opens October 14, 2026. Administrators renewing on fixed schedules rather than through an ACME client with renewal notifications will need to adjust their scripts.","attributionJson":"[{\"source\":\"GIGAZINE\",\"url\":\"https://gigazine.net/news/20261009-lets-encrypt-cuts-certificate-lifetimes-64-days/\",\"title\":\"Let's Encrypt to shorten certificate validity period to 64 days starting February 2027\"}]","lintFlagsJson":null,"lintHits":0,"costUsd":0,"inputTokens":4633,"outputTokens":689,"status":"published","repairAttempts":0,"nextRepairAt":null,"factsAttemptedAt":1791519732,"createdAt":"2026-10-09T04:18:16.000Z","publishedAt":"2026-10-09T04:21:08.000Z","updatedAt":"2026-10-09T04:21:08.000Z"},"cluster":{"id":"c_3d4ad00d11153787afbd3666","canonicalTitle":"Let’s Encryptが2027年2月から証明書の有効期間を64日間に短縮","representativeArticleId":"a_0e6f16d68ba165f93c9c51a1","sourceCount":1,"writtenSourceCount":1,"writeAttempts":0,"isSolo":true,"entitiesJson":"{\"anime_titles\":[],\"manga_titles\":[],\"work_titles\":[],\"studios\":[],\"people\":[],\"type\":\"news\",\"domain\":\"other\",\"is_roundup\":false}","contentType":"news","status":"published","firstSeenAt":"2026-10-09T02:53:00.000Z","lastSeenAt":"2026-10-09T02:53:00.000Z","updatedAt":"2026-10-09T04:21:06.000Z"},"attribution":[{"source":"GIGAZINE","url":"https://gigazine.net/news/20261009-lets-encrypt-cuts-certificate-lifetimes-64-days/","title":"Let’s Encryptが2027年2月から証明書の有効期間を64日間に短縮"}],"entities":{"anime_titles":[],"manga_titles":[],"work_titles":[],"studios":[],"people":[],"type":"news","domain":"other","is_roundup":false},"keyFacts":null}