You can update the group, including all databases the following command: 
turso group update <group-name> [flags]

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Flags

FlagDescription
--extensions stringEnable extensions by passing all or none.
--version stringSpecify the version of the group to update to. Values include latest or canary.
-y, --yesSkip confirmation prompt and confirm.

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Examples

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Update a group to enable all extensions

You can update a group and all its databases to enable all extensions: 
turso group update <group-name> --extensions all