On Friday, Mojang released another patch for Minecraft which fixes some security issues as well as numerous bugs.
The last patch was released in April, which fixed an issue which allowed users to remotely crash servers. The latest version, 1.8.5 fixes a few security issues that have been reported as well as a handful of bug fixes. Issues with beacon effects and an improved server validation for movement packets.
Minecraft 1.8.5 is fully compatible with all previous versions of 1.8 and Mojang has suggested that it is highly recommended to update to 1.8.5 as soon as possible.