I needed to upgrade pg_dump from 9.1.9 to 9.2.4, so I needed to upgrade postgresql as well. I found the solution here.
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wget --quiet -O - http://apt.postgresql.org/pub/repos/apt/ACCC4CF8.asc | sudo apt-key add -
sudo apt-get update
sudo apt-get install postgresql-common -t raring
sudo apt-get install postgresql-9.2
After doing this I symlinked the 9.2.4 pg_dump version:
sudo ln -s /usr/lib/postgresql/9.2/bin/pg_dump /usr/bin/pg_dump