diff --git a/pkgs/applications/virtualization/virtualbox/default.nix b/pkgs/applications/virtualization/virtualbox/default.nix
index 2ce134090fe..440bcd2d9cd 100644
--- a/pkgs/applications/virtualization/virtualbox/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/default.nix
@@ -1,6 +1,6 @@
 { stdenv, fetchurl, lib, iasl, dev86, pam, libxslt, libxml2, libX11, xproto, libXext
 , libXcursor, libXmu, qt4, libIDL, SDL, libcap, zlib, libpng, glib, kernel, lvm2
-, which, alsaLib, curl, gawk
+, which, alsaLib, curl, libvpx, gawk
 , xorriso, makeself, perl, pkgconfig
 , javaBindings ? false, jdk ? null
 , pythonBindings ? false, python ? null
@@ -11,7 +11,7 @@ with stdenv.lib;
 
 let
 
-  version = "4.2.18"; # changes ./guest-additions as well
+  version = "4.3.6"; # changes ./guest-additions as well
 
   forEachModule = action: ''
     for mod in \
@@ -31,13 +31,13 @@ let
   '';
 
   # See https://github.com/NixOS/nixpkgs/issues/672 for details
-  extpackRevision = "88780";
+  extpackRevision = "91406";
   extensionPack = requireFile rec {
     name = "Oracle_VM_VirtualBox_Extension_Pack-${version}-${extpackRevision}.vbox-extpack";
     # IMPORTANT: Hash must be base16 encoded because it's used as an input to
     # VBoxExtPackHelperApp!
-    # Tip: see http://dlc.sun.com.edgesuite.net/virtualbox/4.2.18/SHA256SUMS
-    sha256 = "1d1737b59d0f30f5d42beeabaff168bdc0a75b8b28df685979be6173e5adbbba";
+    # Tip: see http://dlc.sun.com.edgesuite.net/virtualbox/4.3.6/SHA256SUMS
+    sha256 = "983f87e4746a2e6739090d0ce905c24a71e209e87f11c449bdc3d0ca5bb4fde2";
     message = ''
       In order to use the extension pack, you need to comply with the VirtualBox Personal Use
       and Evaluation License (PUEL) by downloading the related binaries from:
@@ -56,12 +56,12 @@ in stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VirtualBox-${version}.tar.bz2";
-    sha256 = "9dbddf393b029c549249f627d12040c1d257972bc09292969b8819a31ab78d74";
+    sha256 = "09xvrk5g14q71lmprcdaci6fks6yilpq99scxslzn1hb5viy2iy5";
   };
 
   buildInputs =
     [ iasl dev86 libxslt libxml2 xproto libX11 libXext libXcursor qt4 libIDL SDL
-      libcap glib lvm2 python alsaLib curl pam xorriso makeself perl
+      libcap glib lvm2 python alsaLib curl libvpx pam xorriso makeself perl
       pkgconfig which libXmu ]
     ++ optional javaBindings jdk
     ++ optional pythonBindings python;
diff --git a/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix b/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
index 805e0b867d9..3cbd59ccabf 100644
--- a/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
+++ b/pkgs/applications/virtualization/virtualbox/guest-additions/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation {
 
   src = fetchurl {
     url = "http://download.virtualbox.org/virtualbox/${version}/VBoxGuestAdditions_${version}.iso";
-    sha256 = "f11a7f13dfe7bf9f246fb877144bb467fe6deadcd876568ec79b6ccd3b59d767";
+    sha256 = "95648fcdb5d028e64145a2fe2f2f28c946d219da366389295a61fed296ca79f0";
   };
 
   KERN_DIR = "${kernel.dev}/lib/modules/*/build";