diff --git a/flake.nix b/flake.nix
index c043f84..9ccd983 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,6 +1,11 @@
 {
   description = "example flake idk";
 
+  nixConfig = {
+    extra-substituters = ["https://cache.garnix.io"];
+    extra-trusted-public-keys = ["cache.garnix.io:CTFPyKSLcx5RMJKfLo5EEPUObbA78b0YQ2DTCJXqr9g="];
+  };
+
   inputs = {
     nixpkgs.url = "nixpkgs/nixos-unstable";
     nixpkgs-stable.url = "nixpkgs/nixos-23.05";
diff --git a/systems/common.nix b/systems/common.nix
index b6befe0..49f661e 100644
--- a/systems/common.nix
+++ b/systems/common.nix
@@ -40,6 +40,7 @@
     settings = {
       auto-optimise-store = true;
       experimental-features = ["nix-command" "flakes"];
+      trusted-users = ["root" "@wheel"];
     };
   };