These new versions have been released and are now available on Qbox. They have been live since Thursday, December 4.
The cleanest way to upgrade is to have us do it for you. Just fill out a support ticket.
Before doing so, consult the release notes for both 1.4.1 and 1.3.6 and test for breaking changes. The big change in this release is an improvement in disk-based shard allocation that puts a halt to additional shard creation when disk use reaches a high watermark.