New upstream release now has support for IPv6. https://sourceforge.net/projects/dict/files/dictd/dictd-1.13.0/
dictd: * add support for IPv6 (the default is IPv4) - Add global configuration option "address_family" and command line options --address-family - Options "listen_to" and --listen-to accepts host name in addition to IP address, "*" means "bind to all interfaces". dict: * add support for IPv6. - New command line options -4 and -6. - dict + dict:// URL: add support for IPv6 address surrounded by [ and ] symbols