How do I request a library to be updated?

While the version numbers seem to match the library GitHub - PaulStoffregen/Encoder: Quadrature Encoder Library for Arduino is newer than what gets loaded from the PlatformIO library manager.

The latest version is 1.4.1:

The download that is part of PlatformIO does not match what is on github. Should I ask the author to update the revision number?

Are you sure? We use tagged branch Release Version 1.4.1 · PaulStoffregen/Encoder · GitHub

If you need the latest upstream version please use lib_deps = or ask author to make a new release.

Yes. 16 commits to master since release 1.4.1. I will message Paul, and use the lib_deps for now.