Let's Encrypt will transition to 64-day certificate lifetimes by default on February 10, 2027, with staging environment testing beginning October 14, 2026. Organizations should update renewal processes to trigger at approximately two-thirds of certificate lifetime and prepare for further reductions to 45 days in 2028, while authorization reuse periods will decrease from 30 days to 10 days.
Let's Encrypt will transition to 64-day certificate lifetimes by default starting February 10, 2027, with staging testing available from October 2026. Organizations should update renewal automation to use two-thirds of certificate lifetime and ensure ACME clients support renewal information (ARI), while authorization reuse periods will decrease from 30 days to 10 days.