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せっかく古いRuby入ったのに

$ bundle install --path=vendor/bundle
:
Retrying fetcher due to error (2/4): Bundler::Fetcher::CertificateFailureError Could not verify the SSL certificate for https://rubygems.org/.
:

ってんもー。Root CAが新しすぎるっぽ。

$ :| openssl s_client -connect rubygems.org:443 2>/dev/null
CONNECTED(00000003)
---
Certificate chain
0 s:CN = rubygems.org
i:C = BE, O = GlobalSign nv-sa, CN = GlobalSign Atlas R3 DV TLS CA 2022 Q1
a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
v:NotBefore: Jan 22 16:45:18 2022 GMT; NotAfter: Feb 23 16:45:17 2023 GMT
1 s:C = BE, O = GlobalSign nv-sa, CN = GlobalSign Atlas R3 DV TLS CA 2022 Q1
i:OU = GlobalSign Root CA - R3, O = GlobalSign, CN = GlobalSign
a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256
v:NotBefore: Oct 20 12:00:00 2021 GMT; NotAfter: Oct 20 00:00:00 2024 GMT
---
: