title: Storybook's migration
body: <p>I want to migrate Storybook from <code>5.0.11</code> to <code>5.2.0</code> but after changing the version in <code>package.json</code> I got:</p>
  
  <pre><code>ERROR in ./node_modules/@storybook/theming/dist/utils.js
  Module not found: Error: Can't resolve 'core-js/modules/es.array.concat' in '/home/twaszczyk/workspaces/ui-elements/node_modules/@storybook/theming/dist'
   @ ./node_modules/@storybook/theming/dist/utils.js 9:0-42
   @ ./node_modules/@storybook/theming/dist/index.js
   @ ./config/.storybook/config.js
   @ multi ./node_modules/@storybook/core/dist/server/common/polyfills.js ./node_modules/@storybook/core/dist/server/preview/globals.js ./config/.storybook/config.js (webpack)-hot-middleware/client.js?reload=true
  
  ERROR in ./node_modules/@storybook/theming/node_modules/@storybook/client-logger/dist/index.js
  Module not found: Error: Can't resolve 'core-js/modules/es.array.concat' in '/home/twaszczyk/workspaces/ui-elements/node_modules/@storybook/theming/node_modules/@storybook/client-logger/dist'
   @ ./node_modules/@storybook/theming/node_modules/@storybook/client-logger/dist/index.js 3:0-42
   @ ./node_modules/@storybook/theming/dist/ensure.js
   @ ./node_modules/@storybook/theming/dist/index.js
   @ ./config/.storybook/config.js
   @ multi ./node_modules/@storybook/core/dist/server/common/polyfills.js ./node_modules/@storybook/core/dist/server/preview/globals.js ./config/.storybook/config.js (webpack)-hot-middleware/client.js?reload=true
  
  ERROR in ./node_modules/@storybook/theming/dist/index.js
  Module not found: Error: Can't resolve 'core-js/modules/es.array.for-each' in '/home/twaszczyk/workspaces/ui-elements/node_modules/@storybook/theming/dist'
   @ ./node_modules/@storybook/theming/dist/index.js 3:0-44
   @ ./config/.storybook/config.js
   @ multi ./node_modules/@storybook/core/dist/server/common/polyfills.js ./node_modules/@storybook/core/dist/server/preview/globals.js ./config/.storybook/config.js (webpack)-hot-middleware/client.js?reload=true
  
  ERROR in ./node_modules/@storybook/theming/dist/convert.js
  Module not found: Error: Can't resolve 'core-js/modules/es.array.index-of' in '/home/twaszczyk/workspaces/ui-elements/node_modules/@storybook/theming/dist'
   @ ./node_modules/@storybook/theming/dist/convert.js 5:0-44
   @ ./node_modules/@storybook/theming/dist/index.js
   @ ./config/.storybook/config.js
   @ multi ./node_modules/@storybook/core/dist/server/common/polyfills.js ./node_modules/@storybook/core/dist/server/preview/globals.js ./config/.storybook/config.js (webpack)-hot-middleware/client.js?reload=true
  </code></pre>
  
  <p>I was looking for also in migration guide but nothing found what I should to do to finish it. </p>