diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index 0906492ad101..4b0768af1e20 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -61,15 +61,15 @@ let
   };
 in releaseTools.nixBuild rec {
   name = "hydra-${version}";
-  version = "2017-02-03";
+  version = "2017-03-21";
 
   inherit stdenv;
 
   src = fetchFromGitHub {
     owner = "NixOS";
     repo = "hydra";
-    rev = "a366f362e197476615a813e2cc904b60db28e65f";
-    sha256 = "0q7bywh59aqgpgj9ca2xscszxal9c3c90bs7sb4cfg7w8g6m69hf";
+    rev = "57bc0eaead8c76ffd71ddc49adfacc47bb8a75ac";
+    sha256 = "1kshl6ms42fgh621s1ba3a224rawqzgvl89rq1k6c9qhlplpndd9";
   };
 
   buildInputs =
diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 3aa555f19160..5603ae1b3243 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -1,5 +1,5 @@
 { lib, stdenv, fetchurl, fetchFromGitHub, perl, curl, bzip2, sqlite, openssl ? null, xz
-, pkgconfig, boehmgc, perlPackages, libsodium, aws-sdk-cpp
+, pkgconfig, boehmgc, perlPackages, libsodium, aws-sdk-cpp, brotli
 , autoreconfHook, autoconf-archive, bison, flex, libxml2, libxslt, docbook5, docbook5_xsl
 , storeDir ? "/nix/store"
 , stateDir ? "/nix/var"
@@ -21,6 +21,7 @@ let
 
     buildInputs = [ curl openssl sqlite xz ]
       ++ lib.optional (stdenv.isLinux || stdenv.isDarwin) libsodium
+      ++ lib.optional fromGit brotli # Since 1.12
       ++ lib.optional ((stdenv.isLinux || stdenv.isDarwin) && lib.versionAtLeast version "1.12pre")
           (aws-sdk-cpp.override {
             apis = ["s3"];
@@ -112,12 +113,12 @@ in rec {
 
   nixUnstable = lib.lowPrio (common rec {
     name = "nix-1.12${suffix}";
-    suffix = "pre5073_1cf4801";
+    suffix = "pre5110_165786d";
     src = fetchFromGitHub {
       owner = "NixOS";
       repo = "nix";
-      rev = "1cf480110879ffc8aee94b4b75999da405b71d7c";
-      sha256 = "1iwpddz0yni7cz2g9asj6nmrwhaai3rhfmkq954hph8nx02c3l02";
+      rev = "165786dbc0ca0b93fadb6e491defac603475b601";
+      sha256 = "0ah68ss5wlpgfpc4k7yl2h3szbwgllyn5d6s464vynaig6b165pz";
     };
     fromGit = true;
   });