--- title: "Let's Encrypt Default certificate lifetime changes to 64 days: 2027-02-10 | Harbyn" description: "Let's Encrypt Default certificate lifetime changes to 64 days, effective Feb 10, 2027." canonical: "https://harbyn.com/changes/letsencrypt/2026-10-07-64-day-certificate-lifetimes-coming-feb-2027" last-updated: 2026-10-08 --- # Let's Encrypt Default certificate lifetime changes to 64 days Markdown version of . Behavior change - Let's Encrypt. medium severity. Announced. Upcoming. From February 10, 2027, Let's Encrypt issues and renews certificates with a 64-day lifetime by default unless a shorter 45- or 6-day lifetime is selected; the last 90-day certificates expire by May 11, 2027, and staging switches on October 14, 2026. Clients using ACME Renewal Info (ARI) need no change; renewals hard-coded to a fixed number of days should move to about two-thirds of the lifetime. Valid certificates are not revoked. 108 days left: the deadline is Feb 10, 2027. ## Facts | Fact | Value | | --- | --- | | Vendor | [Let's Encrypt](https://harbyn.com/vendors/letsencrypt.md) | | Kind | Behavior change | | Severity | medium | | Status | Announced | | Announced | Oct 7, 2026 | | Effective | Feb 10, 2027 | | Added to Harbyn | Oct 8, 2026 | | Lead time | 125 days of warning | | Vendor page | | | Review | Reviewed by a person, extracted by a model | ## Find it in your code ```sh npx harbyn scan ``` This change names no identifier the scanner can match line by line, so the scan tells you whether your repository uses Let's Encrypt, from its packages and API hosts. Nothing leaves your machine. ## Sources Where this event comes from: the page we read, when we read it, and the hash of that snapshot. - (changelog, fetched 2026-10-08 23:25 UTC, sha256 `a273e737e699f10a820e4ca99a63afcbb8cb7e5f95aa667ad75fc3a1cff31ac6`) ## Related changes ### More from Let's Encrypt - [ACME authorization reuse period cut from 30 to 10 days](https://harbyn.com/changes/letsencrypt/2026-10-07-64-day-certificate-lifetimes-coming-feb-2027-2.md) (Behavior change, announced Oct 7, 2026) ### Changes at other vendors - [Amazon Selling Partner API: ORDER\_CHANGE notifications add PreFulfillmentStatusChange for Amazon Autos](https://harbyn.com/changes/amazon-sp-api/2026-10-14-sp-api-updates-new-listings-items-api-ivp-values-in-eu5-jp-and-ca-stores-oct-3.md) (effective Oct 28, 2026) - [BigCommerce: 301 redirects will apply only to storefront channels](https://harbyn.com/changes/bigcommerce/2026-10-07-301-redirects-now-apply-to-storefront-channels-only.md) (effective Nov 10, 2026) - [GitHub: Secret scanning audit log business field changes to enterprise slug](https://harbyn.com/changes/github/2026-10-20-updates-to-github-secret-scanning-7.md) (effective Nov 12, 2026) - [Jira / Atlassian Cloud: New IP address ranges in use from January 1, 2027](https://harbyn.com/changes/atlassian-jira/2026-10-16-atlassian-cloud-adds-new-ip-address-ranges.md) (effective Jan 1, 2027) [All upcoming deadlines](https://harbyn.com/deadlines.md)