diff --git a/pkgs/development/tools/misc/hydra/unstable.nix b/pkgs/development/tools/misc/hydra/unstable.nix
index ce9a45b1f049..f60c0c0b1de7 100644
--- a/pkgs/development/tools/misc/hydra/unstable.nix
+++ b/pkgs/development/tools/misc/hydra/unstable.nix
@@ -122,15 +122,15 @@ let
       ];
   };
 in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "hydra";
-  version = "2024-03-08";
+  version = "2024-07-09";
 
   src = fetchFromGitHub {
     owner = "NixOS";
     repo = "hydra";
-    rev = "8f56209bd6f3b9ec53d50a23812a800dee7a1969";
-    hash = "sha256-mhEj02VruXPmxz3jsKHMov2ERNXk9DwaTAunWEO1iIQ=";
+    rev = "d7986226f0666d5aa0032fdcdb9f38eef6a91dd3";
+    hash = "sha256-9DW0tAiAOfglua76t3viSvIw1gR1EETf0HTAmZklc3I=";
   };
 
   buildInputs = [
@@ -206,19 +206,10 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  patches = [
-    # https://github.com/NixOS/hydra/security/advisories/GHSA-2p75-6g9f-pqgx
-    (fetchpatch2 {
-      name = "CVE-2024-32657.patch";
-      url = "https://github.com/NixOS/hydra/commit/b72528be5074f3e62e9ae2c2ae8ef9c07a0b4dd3.patch";
-      hash = "sha256-+y27N8AIaHj13mj0LwW7dkpzfzZ4xfjN8Ld23c5mzuU=";
-    })
-  ];
-
   postPatch = ''
     # Change 5s timeout for init to 30s
     substituteInPlace t/lib/HydraTestContext.pm \
-      --replace 'expectOkay(5, ("hydra-init"));' 'expectOkay(30, ("hydra-init"));'
+      --replace-fail 'expectOkay(5, ("hydra-init"));' 'expectOkay(30, ("hydra-init"));'
   '';
 
   preCheck = ''
@@ -238,7 +229,7 @@ stdenv.mkDerivation rec {
         wrapProgram $i \
             --prefix PERL5LIB ':' $out/libexec/hydra/lib:$PERL5LIB \
             --prefix PATH ':' $out/bin:$hydraPath \
-            --set-default HYDRA_RELEASE ${version} \
+            --set-default HYDRA_RELEASE ${finalAttrs.version} \
             --set HYDRA_HOME $out/libexec/hydra \
             --set NIX_RELEASE ${nix.name or "unknown"}
     done
@@ -258,4 +249,4 @@ stdenv.mkDerivation rec {
     platforms = platforms.linux;
     maintainers = with maintainers; [ mindavi ] ++ teams.helsinki-systems.members;
   };
-}
+})
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 965fa97f3885..c4e1e27ac3d5 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -21134,7 +21134,7 @@ with pkgs;
 
   hwloc = callPackage ../development/libraries/hwloc { };
 
-  hydra_unstable = callPackage ../development/tools/misc/hydra/unstable.nix { nix = nixVersions.nix_2_20; };
+  hydra_unstable = callPackage ../development/tools/misc/hydra/unstable.nix { nix = nixVersions.nix_2_22; };
 
   hydra-cli = callPackage ../development/tools/misc/hydra-cli { };