Django ProgrammingError in Fields on PostgreSQL

According to the Django docs, JSONField requires PostgreSQL ≥ 9.4 and Psycopg2 ≥ 2.5.4

What PostgreSQL version are you using?

See https://docs.djangoproject.com/en/dev/ref/contrib/postgres/fields/#django.contrib.postgres.fields.JSONField

Ubuntu 14.04 repositories contain only 9.3 version. You can review this to upgrade your version.

Based on the Anonymous comment, I found the following to work:

from django.contrib.postgres import fields

class OldJSONField(fields.JSONField):
    def db_type(self, connection):
        return 'json'

class Stop(models.Model):
    ...
    latest_query_data = OldJSONField(default=dict)
...