[`idna`](https://pypi.org/project/idna/#history) 2.8 was just released. requests is [pinned to `idna>=2.5,<2.8`](https://github.com/requests/requests/blob/57d7284c1a245cf9fbcecb594f50471d86e879f7/setup.py#L46) Can the pin be updated to allow v2.8?