How to fix Yarn packages are out of date in terminal

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  Your Yarn packages are out of date!

  Please run 'yarn install --check-files' to update.

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1. Delete node_modules

$ rm -rf node_modules

2. Delete yarn.lock file

$ rm -rf yarn.lock

3. Install yarn

$ yarn install

4. Upgrade yarn

$ yarn upgrade

5. Run server

$ rails s