Cannot import name 'get_var_name' from 'pymc3.util'

Hello,
I’m trying to import pymc3, but when I’m going to import it, it returns the following error message:
ImportError: cannot import name ‘get_var_name’ from ‘pymc3.util’.

Currently, I’ve installed the following versions (I attached them if they are necessary for your response):
arviz==0.11.0
pymc3==3.10.0

I would be grateful if someone could help me to fix the problem.
Best regards,
Dora