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Rosdep does not support specific version dependencies.

That feature was added to the package xml for enforcement between package versions.

Technically it would be possible to force a version installed for pip packages. However we specifically don't allow specifying versions as we have no way to generically do conflict resolution between packages which might declare different versions selected. Whereas the rosdep database is designed specifically to provide a consistent version that everyone that everyone can rely upon across the system.

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