Hi @woah ,
You can remove the SQL Server 2017 container, then pull and run the 2019 container image. More details please read following MS Docs.
https://learn.microsoft.com/en-us/sql/linux/quickstart-install-connect-docker?view=sql-server-ver15&pivots=cs1-bash
or
https://www.mytecbits.com/apple/macos/removing-sql-server-container-from-docker
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