All cloud.gov PostgreSQL databases will be upgraded to the latest available minor version during the week of Feb 26 - Mar 4.
Upgrades will be conducted during maintenance windows daily from 01:00 EST to 08:59 EST. Your database instance will be unavailable for a few minutes during the upgrade. Your cloud.gov application will be affected if it relies on a PostgreSQL database.
Since PostgreSQL versions 9.3.20, 9.4.15, 9.5.10, and 9.6.6 contain important cumulative security fixes, we are working with AWS RDS to do these upgrades on behalf of cloud.gov customers. If you have questions or concerns, please contact cloud.gov support at firstname.lastname@example.org