[coldtea]

>Sure, but I don't think this is a show stopper. You can and should only carefully upgrade between versions of Docker (and other mission-critical software).

Whether I upgrade carefully or not, the Docker CLI should work with all versions of Docker.

[anotherdpk]

I don't get why this is a sticking point. There's no reason to update the Docker CLI independent of the Docker server, and it would be silly to run two versions of Docker on the same host, so why would it matter?