apt-get update & apt-get upgrade

Lately when I use these two commands it does not seem that my system is updating and upgrading anything. How do I know when something is wrong? How can I check this? Thank you

PING volatile.debian.org (130.89.149.227) 56(84) bytes of data.
64 bytes from kassia4.snt.utwente.nl (130.89.149.227): icmp_seq=1 ttl=52 time=286 ms

PING security.debian.org (150.203.164.38) 56(84) bytes of data.
64 bytes from nashira.anu.edu.au (150.203.164.38): icmp_seq=1 ttl=47 time=31.0 ms

server1:/home/backup# apt-get update

Reading package lists... Done
server1:/home/backup# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
bind9-host dnsutils
0 upgraded, 0 newly installed, 0 to remove and 2 not upgraded.
server1:/home/backup#