You don't need to do anything. OpenBSD doesn't specifically handle leap-seconds, but openntpd will see the change in time from its upstream peers, and will adjust the clock for you.
On 2015 Mar 26 (Thu) at 22:15:17 +0200 (+0200), jin&hitman&Barracuda wrote: :As you know, the leap second issue will occour on 29th. June. I saw :articles on some Linux distro's web page. It looks like there is a bug on :the Linux kernel and it was effected on 2012. : :I would like to ask, is there anything which i should do on my OpenBSD 5.6 ? : :Sorry for my English : -- Equal bytes for women.