Here is how I did updated pygame to version 2.0 in python 3.8. In the video there is also a way to ugrade python 3.8.2 to python 3.8.3 with the web based installer.
If you like me got different version of python 3 (I got also the 3.7), you may want to do so:
py -3.8 -m pip install pygame==2.0.0.dev8
Twitter: @pythonprogrammi - python_pygame