Dependency in sensor's venv intersects with stackstorm internal python package

I have “cryptography” module dependency in my sensor. I’ve installed proper version of this library into my pack’s virtual environment.
But i’ve found that loaded version is from st2 sensor container environment.
Is there any way to totally isolate pack’s venv?
Module reloading is not very helpful cause there a lot of submodules intersection in this library and also versions of C-bindings are in mismatch.