If you look below, the tcpdump version is 4.1.1, the current version is 4.2.1. The version of libpcap installed with tcpdump is 0.8, the current version of libpcap is 1.2.1.
$ apt-cache show tcpdump
Package: tcpdump
Priority: standard
Section: net
Installed-Size: 1060
Maintainer: Ubuntu Developers
Original-Maintainer: Romain Francoise
Architecture: amd64
Version: 4.1.1-2ubuntu2
Depends: libc6 (>= 2.7), libpcap0.8 (>= 1.0.0), libssl1.0.0 (>= 1.0.0)
Suggests: apparmor (>= 2.3)
Filename: pool/main/t/tcpdump/tcpdump_4.1.1-2ubuntu2_amd64.deb
Size: 393778
MD5sum: 9da2f2e39c365aef92a7ddf39edf4720
SHA1: 15426551551032bf10801309fb938165b2aec47f
SHA256: 71072e8c0a29f04b9499229c04aa0b62d2022ceeff5f9a3d9770d8b9124b63b3
Description-en: command-line network traffic analyzer
This program allows you to dump the traffic on a network. tcpdump
is able to examine IPv4, ICMPv4, IPv6, ICMPv6, UDP, TCP, SNMP, AFS
BGP, RIP, PIM, DVMRP, IGMP, SMB, OSPF, NFS and many other packet
types.
.
It can be used to print out the headers of packets on a network
interface, filter packets that match a certain expression. You can
use this tool to track down network problems, to detect attacks
or to monitor network activities.
Homepage: http://www.tcpdump.org/
Description-md5: f01841bfda357d116d7ff7b7a47e8782
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Origin: Ubuntu
Supported: 18m
Task: standard, kubuntu-mobile
Version: 4.2.1 / 1.2.1
Release Date: January 1, 2012
tcpdump-4.2.1.tar.gz (changelog) (PGP signature)
libpcap-1.2.1.tar.gz (changelog) (PGP signature)
tcpdump-workers.asc (tcpdump.org signing key)