diff --git a/pkgs/development/compilers/rustc/head.nix b/pkgs/development/compilers/rustc/head.nix
index ccbfc51b671..2cefc4cfc13 100644
--- a/pkgs/development/compilers/rustc/head.nix
+++ b/pkgs/development/compilers/rustc/head.nix
@@ -2,11 +2,11 @@
 { stdenv, callPackage }:
 
 callPackage ./generic.nix {
-  shortVersion = "2015-12-09";
+  shortVersion = "2016-01-10";
   isRelease = false;
-  forceBundledLLVM = true;
-  srcRev = "462ec0576";
-  srcSha = "1mci0hxwnqb24j4k68rgffqk8ccznz2iddfmyhi8wxa094hqgghp";
+  forceBundledLLVM = false;
+  srcRev = "d70ab2bdf16c22b9f3ff0230089b44855e3f1593";
+  srcSha = "13ssis1bdgg8sdkgrvxcbd1qcfmf7q6bv4akfxrjgdm44l1n1l97";
 
   /* Rust is bootstrapped from an earlier built version. We need
   to fetch these earlier versions, which vary per platform.
@@ -15,12 +15,12 @@ callPackage ./generic.nix {
   with the set you want at the top.
   */
 
-  snapshotHashLinux686 = "e2553bf399cd134a08ef3511a0a6ab0d7a667216";
-  snapshotHashLinux64 = "7df8ba9dec63ec77b857066109d4b6250f3d222f";
-  snapshotHashDarwin686 = "29750870c82a0347f8b8b735a4e2e0da26f5098d";
-  snapshotHashDarwin64 = "c9f2c588238b4c6998190c3abeb33fd6164099a2";
-  snapshotDate = "2015-08-11";
-  snapshotRev = "1af31d4";
+  snapshotHashLinux686 = "a09c4a4036151d0cb28e265101669731600e01f2";
+  snapshotHashLinux64 = "97e2a5eb8904962df8596e95d6e5d9b574d73bf4";
+  snapshotHashDarwin686 = "ca52d2d3ba6497ed007705ee3401cf7efc136ca1";
+  snapshotHashDarwin64 = "3c44ffa18f89567c2b81f8d695e711c86d81ffc7";
+  snapshotDate = "2015-12-18";
+  snapshotRev = "3391630";
 
   patches = [ ./patches/remove-uneeded-git.patch ]
     ++ stdenv.lib.optional stdenv.needsPax ./patches/grsec.patch;
diff --git a/pkgs/development/tools/build-managers/cargo/head.nix b/pkgs/development/tools/build-managers/cargo/head.nix
new file mode 100644
index 00000000000..d5a2dce6682
--- /dev/null
+++ b/pkgs/development/tools/build-managers/cargo/head.nix
@@ -0,0 +1,39 @@
+{ stdenv, fetchgit, rustPlatform, file, curl, python, pkgconfig, openssl
+, cmake, zlib, makeWrapper }:
+
+with rustPlatform;
+
+with ((import ./common.nix) {
+  inherit stdenv rustc;
+  version = "2016-01-10";
+});
+
+buildRustPackage rec {
+  inherit name version meta passthru;
+
+  # Needs to use fetchgit instead of fetchFromGitHub to fetch submodules
+  src = fetchgit {
+    url = "git://github.com/rust-lang/cargo";
+    rev = "ca373452de159491354cf38279dbc19308c91e72";
+    sha256 = "0fx88b3ndvzhfwq159xavs0z5c7jww231kd65cbzyih9g0ab9x65";
+  };
+
+  depsSha256 = "0csagk2dnwg5z0vbxilz1kzcygd4llw7s81ka0xn1g05x30jqrnn";
+
+  buildInputs = [ file curl pkgconfig python openssl cmake zlib makeWrapper ];
+
+  configurePhase = ''
+    ./configure --enable-optimize --prefix=$out --local-cargo=${cargo}/bin/cargo
+  '';
+
+  buildPhase = "make";
+
+  # Disable check phase as there are lots of failures (some probably due to
+  # trying to access the network).
+  doCheck = false;
+
+  installPhase = ''
+    make install
+    ${postInstall}
+  '';
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index eddb75c3144..52ec706ad7b 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -4878,8 +4878,7 @@ let
   rustPlatform = rustStable;
 
   rustStable = recurseIntoAttrs (makeRustPlatform cargo rustStable);
-  rustUnstable = recurseIntoAttrs (makeRustPlatform
-    (cargo.override { rustPlatform = rustUnstableCargoPlatform; }) rustUnstable);
+  rustUnstable = recurseIntoAttrs (makeRustPlatform cargoUnstable rustUnstable);
 
   # rust platform to build cargo itself (with cargoSnapshot)
   rustCargoPlatform = makeRustPlatform (cargoSnapshot rustc) rustCargoPlatform;
@@ -5533,6 +5532,10 @@ let
     rustPlatform = rustCargoPlatform;
   };
 
+  cargoUnstable = callPackage ../development/tools/build-managers/cargo/head.nix {
+    rustPlatform = rustUnstableCargoPlatform;
+  };
+
   cargoSnapshot = rustc:
     callPackage ../development/tools/build-managers/cargo/snapshot.nix {
       inherit rustc;
diff --git a/pkgs/top-level/rust-packages.nix b/pkgs/top-level/rust-packages.nix
index 1f43751bc73..d19131dab83 100644
--- a/pkgs/top-level/rust-packages.nix
+++ b/pkgs/top-level/rust-packages.nix
@@ -7,15 +7,15 @@
 { runCommand, fetchFromGitHub, git }:
 
 let
-  version = "2015-12-23";
-  rev = "0fd482d73d5a13fd49a36d2940ad7a069a6fc049";
+  version = "2016-01-10";
+  rev = "d4120073882c5520f66ed56729b38af2063c2d28";
 
   src = fetchFromGitHub {
       inherit rev;
 
       owner = "rust-lang";
       repo = "crates.io-index";
-      sha256 = "18g69d7npky31rbd4bfcps9180bhfnddg2vhp9w1w0smvgzmg0i3";
+      sha256 = "1xxsaz3inxpkn25afbi8ncwnhns2vpr2f845wk2vs3vv7qpyr0a4";
   };
 
 in