diff --git a/pkgs/tools/package-management/nix/unstable.nix b/pkgs/tools/package-management/nix/unstable.nix
index bfa23325b399..f8d4c1fd119f 100644
--- a/pkgs/tools/package-management/nix/unstable.nix
+++ b/pkgs/tools/package-management/nix/unstable.nix
@@ -5,11 +5,11 @@
 }:
 
 stdenv.mkDerivation rec {
-  name = "nix-1.9pre4132_07c69aa";
+  name = "nix-1.9pre4153_b64988b";
 
   src = fetchurl {
-    url = "http://hydra.nixos.org/build/22635534/download/4/${name}.tar.xz";
-    sha256 = "adaf272b50fce0d8aec34b38b5b62cb3438eeb379f918f85f76f43a7314d23d6";
+    url = "http://hydra.nixos.org/build/22838666/download/4/${name}.tar.xz";
+    sha256 = "51b4870305724aa7b26c92b43cb22a0e9b6798ac2534db493079bfc383244e31";
   };
 
   nativeBuildInputs = [ perl pkgconfig ];