<!DOCTYPE html>
<html>
  <head>
    <title>Redux Auth</title>
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    
    <!-- Auth0Lock script -->
    <script src="//cdn.auth0.com/js/lock-7.12.min.js"></script>
  </head>
  <body>
    <div class="todoapp" id="root"></div>
    <script src="/static/bundle.js"></script>
  </body>
</html>
<!DOCTYPE html>
<html>
  <head>
    <title>Redux Auth</title>
    <!-- Latest compiled and minified CSS -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
    
    <!-- Auth0Lock script -->
    <script src="//cdn.auth0.com/js/lock-9.0.min.js"></script>
  </head>
  <body>
    <div class="todoapp" id="root"></div>
    <script src="/static/bundle.js"></script>
  </body>
</html>

Update lock to version 9
Update lock to version 9