https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/

Update Feb 05, 2024 It’s been two years, and the Android compatibility cross-sign mentioned below is close to expiring. See our recent blog post for a detailed explanation of the changes coming over the course of 2024.
Update September 30, 2021 As planned, the DST Root CA X3 cross-sign has expired, and we’re now using our own ISRG Root X1 for ...
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