diff --git a/pkgs/development/libraries/libpcap/default.nix b/pkgs/development/libraries/libpcap/default.nix
index 73a7cd2e4bb..87e2a641654 100644
--- a/pkgs/development/libraries/libpcap/default.nix
+++ b/pkgs/development/libraries/libpcap/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl, flex, bison }:
 
 stdenv.mkDerivation rec {
-  name = "libpcap-1.2.1";
+  name = "libpcap-1.4.0";
   
   src = fetchurl {
     url = "http://www.tcpdump.org/release/${name}.tar.gz";
-    sha256 = "1gfy00zv6blplw3405q46khmjhdnp6ylblvygjjjk5skgvpscdd1";
+    sha256 = "01klphfqxvkyjvic0hmc10qmiicqz6pv6kvb9s00kaz8f57jlskw";
   };
   
   nativeBuildInputs = [ flex bison ];
diff --git a/pkgs/tools/networking/tcpdump/default.nix b/pkgs/tools/networking/tcpdump/default.nix
index b4b96a549e1..f987d6fa6ba 100644
--- a/pkgs/tools/networking/tcpdump/default.nix
+++ b/pkgs/tools/networking/tcpdump/default.nix
@@ -1,11 +1,11 @@
 { stdenv, fetchurl, libpcap, enableStatic ? false }:
 
 stdenv.mkDerivation rec {
-  name = "tcpdump-4.2.1";
+  name = "tcpdump-4.4.0";
 
   src = fetchurl {
     url = "http://www.tcpdump.org/release/${name}.tar.gz";
-    sha256 = "1zwv9zp169dwqwwwi6lfd3fhiayiq81ijqmwi0pfdvw63skfjmsl";
+    sha256 = "1g9h2p31xwpdg88v7wv9hc8calq8sjs25800vzd9i45q5knln9qj";
   };
 
   buildInputs = [ libpcap ];