Are there any tools for converting vCard version 3 to version 4 (ideally for Linux)?

I'm trying to export my contacts from Gmail and load them in Protonmail, but Gmail only exports as vCard version 3, while Protonmail only supports loading version 4.

Web searching reveals some similar tools for converting version 2 to 3, including this similar question, but I'm having trouble finding a tool to support version 4.

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