You can do this with the pglogical extension. I asked a similar question about a week ago.
—
Jay
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> On Jul 11, 2018, at 10:38 AM, Mariel Cherkassky <mariel(dot)cherkassky(at)gmail(dot)com> wrote:
>
> Hi,
> I have in my company 3 postgresql nodes(v9.6) that are configured as one primary and 2 slaves. The repmgr tool is reponsible for the replication. I want to upgrade all the nodes to version 10.4. I know that PostgreSQL doesnt support streaming replication between different major versions. Did someone try this kind of upgrade without having any downtime ?
>
> Thanks , Mariel.