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diff -up dovecot-2.3.15/doc/dovecot-openssl.cnf.bigkey dovecot-2.3.15/doc/dovecot-openssl.cnf
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--- dovecot-2.3.15/doc/dovecot-openssl.cnf.bigkey	2021-06-21 20:24:51.913456628 +0200
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+++ dovecot-2.3.15/doc/dovecot-openssl.cnf	2021-06-21 20:25:36.352912123 +0200
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@@ -1,5 +1,5 @@
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 [ req ]
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-default_bits = 2048
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+default_bits = 3072
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 encrypt_key = yes
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 distinguished_name = req_dn
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 x509_extensions = cert_type