New updated released about 14 hours ago.
Nothing big in this update, mostly security issues and improved Realms functionality. This update is compatible with all 1.8 versions.
Original post:
We have released Minecraft version 1.8.8 to fix some security issues and improved some functionality within Realms. Updating is highly recommended from older versions, and is 100% compatible with all 1.8 versions.
Source: http://mcupdate.tumblr.com/post/125341593429/minecraft-188