Pants needs 9.4, but as long as Heroku considers 9.4 "beta", we can only provision PostgreSQL 9.3 as part of the Heroku Button-One-Click-process. Once 9.4 becomes GA, this will probably fix itself automatically.
I've changed the one field that uses JSONB back to JSON for the time being to get the Heroku deploy working again. Once Heroku makes 9.4 available officially, we need to switch back.
Pants needs 9.4, but as long as Heroku considers 9.4 "beta", we can only provision PostgreSQL 9.3 as part of the Heroku Button-One-Click-process. Once 9.4 becomes GA, this will probably fix itself automatically.