Would you please upgrade PostageSQL?
PostageSQL provides some powerful function to process non-relational data (eg: "jsonb") after version 9.4.
Would you please upgrade that?
If you mean PostgreSQL, we support 9.4 version in the current 12.5 version – https://docs.plesk.com/release-notes/12.5/software-requirements/#s4-2-1 and upcoming Plesk Onyx – https://docs.plesk.com/release-notes/17.0/software-requirements/#s4-2-1
We will officially support next versions if many people will support your request. But I think that you can try to use 9.5 version right now. It should work, but we have not tested it yet.
Yes, I mean PostgreSQL.
However we using Ubuntu 14 OS, it seems provide PostgreSQL 9.3 version only?