Mitmproxy v2.0.2 not working with IPv6?

I have just downloaded Mitmproxy v2.0.2 on Debian 9, I can connect to it using my IPv4 IP, but none of the ipv6 IPs. Is this something that needs to be enabled?

Thanks @arya6000! Would you mind checking this behavior with the latest snapshot from and file an issue on GitHub if it persists?