vSAN 6.7 is a new release that requires a full upgrade to vSphere 6.7.
Perform the following tasks to complete the upgrade to vSAN 6.7:
1. Upgrade to vCenter Server 6.7. For more information, see the VMware vSphere 6.7 Release Notes.
2. Upgrade hosts to ESXi 6.7. For more information, see the VMware vSphere 6.7 Release Notes.
3. Upgrade the vSAN on-disk format to version 6.0.
If you upgrade from on-disk format version 5.0, no data evacuation is performed as the disks are reformatted.
Note: Upgrading from vSphere 6.5 Update 2 to vSphere 6.7 is not supported.