The DTLS 1.3 standard has recently been published in April 2022 in RFC 9147. It features many improvements and additions to increase the security and efficiency of the DTLS protocol. At wolfSSL, we like to be very quick adopters of new standards, which is why initial support for DTLS 1.3 was merged in June and appeared in wolfSSL release 5.4.0.
Another exciting feature of DTLS 1.3 is post-quantum cryptography! It is available in wolfSSL using the same interface as for TLS 1.3. In TLS 1.3, the handshake protocol has been simplified to one round trip from the previous two round trips. DTLS 1.2 and 1.3 both add an extra round trip for the stateless cookie exchange.