3.2, if pip is to be believed.
➤ pip3 show pymc3
Name: pymc3
Version: 3.2
Summary: PyMC3
Home-page: http://github.com/pymc-devs/pymc3
Author: Thomas Wiecki
Author-email: thomas.wiecki@gmail.com
License: Apache License, Version 2.0
Location: /home/eichhorn/.local/lib/python3.6/site-packages
Requires: pandas, six, joblib, patsy, h5py, theano, tqdm