The 0.13.9 version of trezor released last week breaks the Trezor plugin.
This does not affect recent releases, which were packaged with 0.13.8 (see contrib/deterministic-build/requirements-hw.txt)
For now it is best to keep supporting 0.13.8 and keep using it for releases because I only did basic tests with 0.13.9. I will keep testing the new version of the library for a while before dropping support for 0.13.8.