mixbox>=1.0.4
cybox<2.1.1.0,>=2.1.0.13
python-dateutil

[:python_version == "2.7" or python_version >= "3.5"]
lxml>=2.2.3

[:python_version > "2.7" and python_version < "3.5"]
lxml<4.4.0,>=2.2.3
