...
Even if you will not be making a new box file for this version, you need to update the Vagrant files. The release Vagrant files (vagrant/release/devstack/Vagrantfile and vagrant/release/fullstack/Vagrantfile) will need to be updated to pull down the correct box file when the appropriate value is set for the OPENEDX_RELEASE environment variable. Pay NOTE: the Analytics team releases Analytics devstack, you don't have to do that.
Pay close attention to the syntax in the file; the name you put there doesn't have the .box suffix:
...