Due to the CompatHelper PRs of the upstream packages not being merged
pkg> add DifferentiationInterface@0.6
Resolving package versions...
ERROR: Unsatisfiable requirements detected for package CTBase [54762871]:
CTBase [54762871] log:
├─possible versions are: 0.11.2-0.14.0 or uninstalled
├─restricted by compatibility requirements with OptimalControl [5f98b655] to versions: 0.11.2-0.13.1
│ └─OptimalControl [5f98b655] log:
│ ├─possible versions are: 0.9.3-0.12.3 or uninstalled
│ └─restricted to versions * by project [d3adefeb], leaving only versions: 0.9.3-0.12.3
│ └─project [d3adefeb] log:
│ ├─possible versions are: 0.0.0 or uninstalled
│ └─project [d3adefeb] is fixed to version 0.0.0
└─restricted by compatibility requirements with DifferentiationInterface [a0c0ee7d] to versions: uninstalled — no versions left
└─DifferentiationInterface [a0c0ee7d] log:
├─possible versions are: 0.1.0-0.6.29 or uninstalled
└─restricted to versions 0.6 by an explicit requirement, leaving only versions: 0.6.0-0.6.29
Due to the CompatHelper PRs of the upstream packages not being merged