10/11/2026
In April 2025, the CA/Browser Forum, the body that sets the rules for public certificates, voted unanimously to cut their maximum life from 398 days to 47 days by March 2029.
The change is phased: 200 days in 2026, 100 days in 2027, and 47 days in 2029. Domain validation also has to be repeated far more often. In practice, certificates will need renewing roughly every six weeks, with ownership reverified nearly every time.
The intent was deliberate. The 47-day limit was chosen specifically to make manual certificate management impractical and force automation. The teams that already have a complete certificate inventory and automated renewal will barely notice the change. The ones that donât will meet each phase as a fresh round of outages, usually from a certificate nobody knew they had.
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