To use the latest Python with PyCharm you need to follow several steps:
1. Download and install the latest version of python from its official website on your system.
2. Press Ctrl + Alt + S top open the Add Python Interpreter Dialog Box
3. In the left hand pane select system interpreter.
4. Then type in the full absolute python to the interpreter.
5. Click on OK for the change to take effect.
Take a look at this video to learn more about python: