Error rendering notebook 08-Designing-Kalman-Filters.ipynb

There seems to be an issue for 08-Designing-Kalman-Filters.ipynb

> Invalid Notebook
  There was an error rendering your Notebook: the 'application/vnd.jupyter.widget-state+json' key is missing from json
  Using nbformat v5.10.4 and nbconvert v7.16.6


I guess the version of nbformat or nbconvert needs to be updated.