TLS certificate lifetime changes: What CISOs must do now | TechTarget

Organizations that rely on manual TLS certificate lifecycle management are racing against the clock. The 200-day certificate timeline, which took effect in March 2026, means the first wave of certificate renewals will arrive within a matter of months.

"People will feel the realities when they start to renew those first sets of certificates," said Sarah Almond, an analyst at Gartner. Nick France, CTO at Sectigo, a certificate authority (CA) and certificate lifecycle management (CLM) provider, agreed, calling September and October a "wake-up call" for organizations that aren't ready.

The March 2026 change is just the first in a series of updates to certificate lifetimes. The phased approach set by the CA/Browser Forum, a consortium of CAs and browser vendors that sets standards for digital certificates, will further reduce the period to 100 days in March 2027 and ultimately to 47 days in March 2029.

The changing lifetimes are...

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