Upgrade Minor Version of Postgres in Debian using apt

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http://unix.stackexchange.com – I'm trying to move from 9.1.3 to 9.1.4. I thought all I had to do was "apt-get update" and "apt-get upgrade", but that didn't work. It did install some updates, but that was only for 9.1.3. Any ideas what I'm doing wrong here? (HowTos)