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For compatibility with older Android devices, we'll be relying on a signature from an expired roo... For compatibility with older Android devices, we'll be relying on a signature from an expired root, which is supported by Android. However, as Ryan Sleevi points out in "Path Building vs Path Verifying," older versions of OpenSSL will reject a certificate chain that includes a signature by an expired root, even if OpenSSL could validate the chain by ignoring that certificate. Let’s Encrypt is not