diff --git a/nix/nixos-module/container/defaults.nix b/nix/nixos-module/container/defaults.nix
index dbbe16c..2eaf2e5 100644
--- a/nix/nixos-module/container/defaults.nix
+++ b/nix/nixos-module/container/defaults.nix
@@ -19,9 +19,11 @@
     );
   
   nix = {
-    useSandbox = false;
-    maxJobs = lib.mkDefault 1;
-    buildCores = lib.mkDefault 1;
+    settings = {
+      sandbox = false;
+      max-jobs = lib.mkDefault 4;
+      cores = lib.mkDefault 4;
+    };
   };
 
   systemd.services =
diff --git a/nix/nixos-module/defaults.nix b/nix/nixos-module/defaults.nix
index 62324d7..51563e2 100644
--- a/nix/nixos-module/defaults.nix
+++ b/nix/nixos-module/defaults.nix
@@ -26,10 +26,12 @@
       nixpkgs.flake = inputs.nixpkgs;
     };
 
-    binaryCachePublicKeys = [
-      "nix-serve.hq.c3d2.de:KZRGGnwOYzys6pxgM8jlur36RmkJQ/y8y62e52fj1ps=%"
-    ];
-    binaryCaches = lib.mkBefore [ "https://hydra.hq.c3d2.de" ];
+    settings = {
+      substituters = lib.mkBefore [ "https://hydra.hq.c3d2.de" ];
+      trusted-public-keys = [
+        "nix-serve.hq.c3d2.de:KZRGGnwOYzys6pxgM8jlur36RmkJQ/y8y62e52fj1ps=%"
+      ];
+    };
   };
 
   documentation = {