The metadata from the Maven central repository was changed to include only 1.6.1. It's not the release of the new version so much as this change. I'll look into putting the old version on our own repo, but Maven seems to prefer its own repo first. For now, if you'd like, you can modify your uberpom locally to use 1.6.1. I haven't found any issues (yet) with 1.6.1.