Valve has pushed out SteamOS update 89 along with updates today to the SteamOS Alchemist beta.
SteamOS changes that landed today to both the "Alchemist" and "Alchemist Beta" repositories include updating the Iceweasel (Firefox-derived) web-browser to 24.3.0esr, valve-bugreporter
improvements for reporting more package versions, package updates, and fixing a bug where mouse input would sometimes stop when holding a mouse button. Package updates to both repositories include Apache2, OpenSSL, TZdata, and e2fsprogs. These package updates were pulled in from the Debian stable repository as bug-fixes.
Landing in the stable package repository for SteamOS were also some earlier Alchemist beta changes
More details at SteamCommunity.com