Logger is missing

[mullermp]

Logger appears to be missing, but I notice in the repo there is a reference to Logger already. Am I doing something wrong? rbs version 3.2.0.

sig/lib/hearth/http/client.rbs:6:80: [error] Cannot find type `Logger`
│ Diagnostic ID: RBS::UnknownTypeName
│
└       def transmit: (request: HTTP::Request, response: HTTP::Response, ?logger: Logger?) -> void