diff --git a/pkgs/development/tools/misc/hydra/unstable.nix b/pkgs/development/tools/misc/hydra/unstable.nix
index 373f80a2f052..544a0221737e 100644
--- a/pkgs/development/tools/misc/hydra/unstable.nix
+++ b/pkgs/development/tools/misc/hydra/unstable.nix
@@ -123,16 +123,17 @@ let
 in
 stdenv.mkDerivation rec {
   pname = "hydra";
-  version = "2023-12-01";
+  version = "2023-12-04";
 
   src = fetchFromGitHub {
     owner = "NixOS";
     repo = "hydra";
-    rev = "4d1c8505120961f10897b8fe9a070d4e193c9a13";
-    hash = "sha256-vXTuE83GL15mgZHegbllVAsVdDFcWWSayPfZxTJN5ys=";
+    rev = "4dc8fe0b08edc421c251270ccd4be3e5bf9d66b4";
+    hash = "sha256-FjyMb5ZbPa2GLrRuFMUP/foKb0KvXFKThvgc9faFIw8=";
   };
 
   buildInputs = [
+    unzip
     libpqxx
     top-git
     mercurial
@@ -179,7 +180,6 @@ stdenv.mkDerivation rec {
     makeWrapper
     pkg-config
     mdbook
-    unzip
     nukeReferences
   ];
 
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6679e1dee8e4..e32f668e0d65 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -22083,7 +22083,7 @@ with pkgs;
 
   hwloc = callPackage ../development/libraries/hwloc { };
 
-  hydra_unstable = callPackage ../development/tools/misc/hydra/unstable.nix { nix = nixVersions.nix_2_18; };
+  hydra_unstable = callPackage ../development/tools/misc/hydra/unstable.nix { nix = nixVersions.nix_2_19; };
 
   hydra-cli = callPackage ../development/tools/misc/hydra-cli { };