Just a word of warning. Updating to latest Bazel breaks the Gerrit build. I've already reported this to the Bazel group:
Reinstalling the previous version (0.15.2) allows the build to succeed again.
By the way, for those using Debian derivatives, the apt repository does not publish older versions so it's not possible to reinstall then using apt-get.
Instead, I just purged the package, downloaded the previous working version and installed it using dpkg:
  sudo apt-get purge bazel
  sudo dpkg -i bazel_*.deb