If you are facing any problem after updating to Kalium 2.1 please read Kalium 2.1 Release notes.

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Kalium Changelog

Kalium is constantly being updated with new features, bug fixes, and adjustments. On this link Kalium Changelog you can see complete changelog information.

We recommend you to read the changelog for every release since the last time you updated. Also consider deactivating caching plugins temporarily to avoid the caching of old markup when you update the theme.