diff --git a/home/base/nix/default.nix b/home/base/nix/default.nix
index c838854c..94b8299a 100644
--- a/home/base/nix/default.nix
+++ b/home/base/nix/default.nix
@@ -1,4 +1,21 @@
+{ pkgs, ... }:
+
 {
+  nix = {
+    package = pkgs.nix;
+    settings = {
+      substituters = [
+        "https://christianharke.cachix.org/"
+        "https://nix-community.cachix.org"
+        "https://cache.nixos.org"
+      ];
+      trusted-public-keys = [
+        "christianharke.cachix.org-1:TzmbiNLRcH8G0932XRlQzh8GPvuV9pJcHLqLnzznLKU="
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+      ];
+    };
+  };
   nixpkgs.config = import ./nixpkgs-config.nix;
   xdg.configFile."nixpkgs/config.nix".source = ./nixpkgs-config.nix;
 }
diff --git a/nixos/base/nix/default.nix b/nixos/base/nix/default.nix
index 210bdff2..aa35dd66 100644
--- a/nixos/base/nix/default.nix
+++ b/nixos/base/nix/default.nix
@@ -6,14 +6,24 @@
   ];
 
   nix = {
-    extraOptions = ''
-      experimental-features = nix-command flakes
-    '';
     gc = {
       automatic = true;
       dates = "04:00";
       options = "--delete-older-than 7d";
     };
+    settings = {
+      experimental-features = [ "nix-command" "flakes" ];
+      substituters = [
+        "https://christianharke.cachix.org/"
+        "https://nix-community.cachix.org"
+        "https://cache.nixos.org"
+      ];
+      trusted-public-keys = [
+        "christianharke.cachix.org-1:TzmbiNLRcH8G0932XRlQzh8GPvuV9pJcHLqLnzznLKU="
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+      ];
+    };
   };
 
   nixpkgs.config.allowUnfree = true;