Python 3.7 Error: Unsupported Pickle Protocol 5

I'm trying to restore a pickled config file from RLLib (json didn't work as shown in this post), and getting the following error:

config = pickle.load(open(f"{path}/params.pkl", "rb"))

---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-28-c964561b863c> in <module>
----> 1 config = pickle.load(open(f"{path}/params.pkl", "rb"))

ValueError: unsupported pickle protocol: 5

Python Version = 3.7.0

How can I open this file in 3.7?