Let's Encrypt cuts certificate lifetimes to 64 days starting 2027

From February 10, 2027, Let's Encrypt will issue certificates valid for 64 days instead of 90, dropping to 45 days in 2028. The authorization reuse period falls from 30 to 10 days, and the staging environment began issuing 64-day certificates on October 14, 2026.

• Certificates last 64 days from February 10, 2027, and 45 days in 2028
• The last 90-day certificate expires around May 11, 2027
• Authorization reuse period drops from 30 to 10 days
• Clients with ARI support should renew at about two-thirds of the lifetime