Specifically for PostgreSQL version 9.5
Version type: major.
Released: January 2016.
EOL: January 2021 (in accordance with Postgres 5 year rule).
New features highlight
Far from complete list, only few chosen from across whole (long) list:
INSERTs now may be ignored or turned into
Block Range INdex added (BRIN)
High number of performance changes
ALTER SYSTEM RESET(resets value in
Complete list linked below.