Nagios Core 3.4.1 was just released and can be grabbed from the downloads page. The Changelog can be found here. This release fixed a bug that affected 3.4.0. Thanks to Andreas Ericsson and Eric Stanley for the quick bugfix and release.
Nagios Update: XI 5.6.6
Nagios XI update 5.6.6 is now released! This update resolves a number of minor bugs and one security vulnerability fix. This version also includes improvements