Maybe I am missing something, but uri-template format is not listed here https://github.com/Julian/jsonschema/edit/master/docs/validate.rst
I found the code to support it https://github.com/Julian/jsonschema/blob/89f0f22a949e3561d05576f27e9a97c8233e2ee9/jsonschema/_format.py#L381, though in the same time there's no uritemplate dependency in setup https://github.com/Julian/jsonschema/blob/master/setup.cfg