9.5 became the Postgres Default on Circle CI

circle.yml

# ...
dependencies:
  override:
    # Delete these two lines
    - sudo service postgresql stop 9.4
    - sudo cp -v /etc/postgresql/9.{4,5}/main/pg_hba.conf && sudo service postgresql restart 9.5
# ...
database:
  override:
  # Delete lines like these below. Yours won't be the same, but we had to do something
  # like this to get connected to 9.5 before it became default due to our database
  # setup.
  - sudo -u postgres dropuser -p $DBPORT $USER		
  - sudo -u postgres createuser -p $DBPORT $USER
  - sudo -u postgres createdb -p $DBPORT -O $USER $USER
  - sudo -u postgres psql -p $DBPORT --command="ALTER USER $USER superuser"
  
# Then the 9.5 port was 5433 (when it wasn't default), now use 5432 to connect to the database