I have a React project running with React and React DOM version 18. I am also using Cypress for component testing and styled components for styles.
What I have been facing is that every time I run yarn upgrade it upgrades some dependencies in the lock file, I don’t see anything in the package.json either. Is that what yarn upgrade does? Why doesn’t it update the dependencies in package.json? Is it a good or bad practice to do?

Another problem is that, after running the yarn upgrade I can see that my Cypress unit tests are failing with the following error:

The following error originated from your test code, not from Cypress.

    > Cannot create styled-component for component: undefined.
    
    When Cypress detects uncaught errors originating from your test code it will automatically fail the current test.
    
    Cypress could not associate this error to any specific test.
    
    We dynamically generated a new test to display this failure.

Why is it so, are there any workarounds I can follow to fix the above tests failing?