diff --git a/darwin/common.nix b/darwin/common.nix
index b78ae45..ed858b2 100644
--- a/darwin/common.nix
+++ b/darwin/common.nix
@@ -183,6 +183,13 @@ in
 
   nix.settings = {
     experimental-features = lib.mkDefault "nix-command flakes";
+    trusted-substituters = [
+      "https://nixpkgs-terraform.cachix.org"
+    ];
+
+    trusted-public-keys = [
+      "nixpkgs-terraform.cachix.org-1:8Sit092rIdAVENA3ZVeH9hzSiqI/jng6JiCrQ1Dmusw="
+    ];
   };
 
   homebrew = {