Debian: package updates in stable distribution

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http://unix.stackexchange.com – I am running Debian Wheezy, which is the current stable Debian distribution. In my /etc/apt/sources.list, I have something like the following: deb http://ftp.de.debian.org/debian wheezy main deb http://ftp.de.debian.org/debian-security/ wheezy/updates main When I run apt-get update and apt-get upgrade, I would expect that only security updates will be installed. However, I see that there are other packages which want to be updated, such as: dpkg (1.16.10) -> (1.16.12) could somebody please explain what is the debian update policy? Why were these packaged updated? I was under the impre (HowTos)