What is the difference from version 4? Want to understand what the improvements are and how to migrate. Thank you for this wonderful API!

Vega-Lite API 5 uses Vega-Lite 5. Have a look at the changelog: https://github.com/vega/vega-lite/releases/tag/v5.0.0

Should we update to vega-lite@5.2.0, vega-tooltip@0.28.0 and vega@5.21.0 ?

I think that would be good. There should be no breaking changes.

Upgraded to Vega-Lite 5.6, etc.!