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curl/docs/cmdline-opts/tlsv1.3.d

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+Long: tlsv1.3
+Help: Use TLSv1.3 or greater
+Protocols: TLS
+Added: 7.52.0
+Category: tls
+---
+Forces curl to use TLS version 1.3 or later when connecting to a remote TLS
+server.
+
+If the connection is done without TLS, this option has no effect. This
+includes QUIC-using (HTTP/3) transfers.
+
+Note that TLS 1.3 is not supported by all TLS backends.