diff --git a/nixos/modules/services/continuous-integration/hydra/default.nix b/nixos/modules/services/continuous-integration/hydra/default.nix
index 43fec5ff5bb2..2fa7c59a965d 100644
--- a/nixos/modules/services/continuous-integration/hydra/default.nix
+++ b/nixos/modules/services/continuous-integration/hydra/default.nix
@@ -28,6 +28,7 @@ let
 
   serverEnv = env //
     { HYDRA_TRACKER = cfg.tracker;
+      XDG_CACHE_HOME = "${baseDir}/www/.cache";
       COLUMNS = "80";
       PGPASSFILE = "${baseDir}/pgpass-www"; # grrr
     } // (optionalAttrs cfg.debugServer { DBIC_TRACE = "1"; });
@@ -225,14 +226,14 @@ in
 
     services.hydra.extraConfig =
       ''
-        using_frontend_proxy 1
-        base_uri ${cfg.hydraURL}
-        notification_sender ${cfg.notificationSender}
-        max_servers 25
+        using_frontend_proxy = 1
+        base_uri = ${cfg.hydraURL}
+        notification_sender = ${cfg.notificationSender}
+        max_servers = 25
         ${optionalString (cfg.logo != null) ''
-          hydra_logo ${cfg.logo}
+          hydra_logo = ${cfg.logo}
         ''}
-        gc_roots_dir ${cfg.gcRootsDir}
+        gc_roots_dir = ${cfg.gcRootsDir}
         use-substitutes = ${if cfg.useSubstitutes then "1" else "0"}
       '';
 
diff --git a/pkgs/development/tools/misc/hydra/default.nix b/pkgs/development/tools/misc/hydra/default.nix
index e8ebc617d198..613a4fec8530 100644
--- a/pkgs/development/tools/misc/hydra/default.nix
+++ b/pkgs/development/tools/misc/hydra/default.nix
@@ -62,15 +62,15 @@ let
   };
 in releaseTools.nixBuild rec {
   name = "hydra-${version}";
-  version = "2017-10-26";
+  version = "2017-11-21";
 
   inherit stdenv;
 
   src = fetchFromGitHub {
     owner = "NixOS";
     repo = "hydra";
-    rev = "2cdc84f34f4de647dd89c5ef503782a3a48ff623";
-    sha256 = "1gcp22ldyc914aik4yhlzy60ym7z8513pvp0ag5637j44nz0rf7h";
+    rev = "b7bc4384b7b471d1ddf892cb03f16189a66d5a0d";
+    sha256 = "05g37z3ilazzqa5rqj5zljndwxjbvpc18xibh6jlwjwpvg3kpbbh";
   };
 
   buildInputs =