Since the last release, we fixed updated the asynchronous inner process communication (IPC) client to work properly with the changes in mypy version 1.20.0, updated dependencies, and added a new user configuration option force_base_ipc_request which will allow you to force the async IPC client module to use mypy's provided IPC framework instead of the reimplemented version we ship in the event something like this happens again, although our reimplementation should still work better.

Full Changelog: v1.4.1...v1.4.2