diff --git a/hosts/darwin/spotlights-macbook-air/configuration.nix b/hosts/darwin/spotlights-macbook-air/configuration.nix
index 92be879..56e7dd6 100644
--- a/hosts/darwin/spotlights-macbook-air/configuration.nix
+++ b/hosts/darwin/spotlights-macbook-air/configuration.nix
@@ -40,8 +40,14 @@
   nix = {
     # Keep the latest version of Nix.
     package = pkgs.nix;
-    # Necessary for using flakes on this system.
-    settings.experimental-features = "nix-command flakes";
+    settings = {
+      # Necessary for using flakes on this system.
+      experimental-features = "nix-command flakes";
+  
+      # Include Garnix
+      extra-substituters = [ "https://cache.garnix.io" ];
+      extra-trusted-public-keys = [ "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=" ];
+    };
   };
 
   # Create /etc/zshrc that loads the nix-darwin environment.
diff --git a/hosts/linux/cyclone/configuration.nix b/hosts/linux/cyclone/configuration.nix
index 7be0f2d..22cc7d5 100644
--- a/hosts/linux/cyclone/configuration.nix
+++ b/hosts/linux/cyclone/configuration.nix
@@ -27,6 +27,10 @@
     experimental-features = [ "flakes" "nix-command" ];
     trusted-users = [ "spotlight" ];
     builders-use-substitutes = true;
+
+    # Include Garnix
+    extra-substituters = [ "https://cache.garnix.io" ];
+    extra-trusted-public-keys = [ "cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g=" ];
   };
 
   # Select internationalisation properties.