People keep raving about google3, but it had recurring problems with changelists (far outside your own project) that break the world and stop you from testing or deploying anything new for hours. Eventually they had to give up on using everything at head, and instead use known-good versions of major shared dependencies that were a few hours or days behind head.

I want to bump our dependencies when we have the slack to handle the risks. Alpha testing every commit of every library is not really how our team is supposed to be spending our time.