-r base.txt
-r crypto.txt

pyzmq<=20.0.0; python_version < "3.6"
pyzmq>=20.0.0; python_version >= "3.6"
# We can't use 23+ on Windows until they fix this:
# https://github.com/zeromq/pyzmq/issues/1472
pyzmq>=20.0.0,<=22.0.3 ; sys_platform == "win32"
