title: How to fix Yarn packages are out of date in terminal
body: <p>I am always after being installed yarn.</p>
  
  <pre><code>=&gt; Booting Puma
  =&gt; Rails 6.0.0.rc2 application starting in development 
  =&gt; Run `rails server --help` for more startup options
  Usage: yarn [options]
  
  yarn: error: no such option: --integrity
  
  
  ========================================
    Your Yarn packages are out of date!
    Please run `yarn install --check-files` to update.
  ========================================
  
  
  To disable this check, please change `check_yarn_integrity`
  to `false` in your webpacker config file (config/webpacker.yml).
  </code></pre>