diff --git a/nixos/modules/services/continuous-integration/hydra/default.nix b/nixos/modules/services/continuous-integration/hydra/default.nix
index c4bad59a6fb6..a8a8973f25ba 100644
--- a/nixos/modules/services/continuous-integration/hydra/default.nix
+++ b/nixos/modules/services/continuous-integration/hydra/default.nix
@@ -515,10 +515,12 @@ in
           ''
             set -eou pipefail
             compression=$(sed -nr 's/compress_build_logs_compression = ()/\1/p' ${baseDir}/hydra.conf)
-            if [[ $compression == zstd ]]; then
+            if [[ $compression == "" ]]; then
+              compression="bzip2"
+            elif [[ $compression == zstd ]]; then
               compression="zstd --rm"
             fi
-            find ${baseDir}/build-logs -type f -name "*.drv" -mtime +3 -size +0c | xargs -r $compression --force --quiet
+            find ${baseDir}/build-logs -type f -name "*.drv" -mtime +3 -size +0c | xargs -r "$compression" --force --quiet
           '';
         startAt = "Sun 01:45";
         serviceConfig.Slice = "system-hydra.slice";
diff --git a/pkgs/by-name/hy/hydra/package.nix b/pkgs/by-name/hy/hydra/package.nix
index ca09fcee4868..661eb4d0231c 100644
--- a/pkgs/by-name/hy/hydra/package.nix
+++ b/pkgs/by-name/hy/hydra/package.nix
@@ -124,13 +124,13 @@ let
 in
 stdenv.mkDerivation (finalAttrs: {
   pname = "hydra";
-  version = "0-unstable-2024-09-15";
+  version = "0-unstable-2024-09-20";
 
   src = fetchFromGitHub {
     owner = "NixOS";
     repo = "hydra";
-    rev = "b6f44b5cd020d95c405e149e4c3a0e9dc785e31a";
-    hash = "sha256-dXDOX6IvAeznNoh73P2QWstBJ/jqfzEKjgNvdfsGTuY=";
+    rev = "44248d3cf4162944ec2e6a45f8cc058758bf5a86";
+    hash = "sha256-WJ7M/1a8j5gRJJVzCJL6JrkGPckD5ZhKzTlmiKNdtm0=";
   };
 
   buildInputs = [