Note: you may need to restart the kernel to use updated packages.

This message is usually displayed when you install or update packages in your Python environment using pip or conda. It means that the changes made by the package installation or update may not take effect until you restart the kernel of the Jupyter notebook or the Python interpreter that you are using. To restart the kernel in a Jupyter notebook, you can go to the Kernel menu and choose "Restart Kernel". In a Python interpreter, you can simply exit and restart the interpreter.