diff --git a/modules/hosts/darwin/default.nix b/modules/hosts/darwin/default.nix
index 1c182bd..77f01cf 100644
--- a/modules/hosts/darwin/default.nix
+++ b/modules/hosts/darwin/default.nix
@@ -114,18 +114,16 @@
         "flakes"
         "nix-command"
       ];
-      substituters = [
-        "https://cache.nixos.org" # default one
+      extra-substituters = [
         "https://cache.flox.dev"
         "https://cache.numtide.com"
         "https://cache.thalheim.io"
         "https://nix-community.cachix.org"
       ];
-      trusted-public-keys = [
-        "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" # default one
-        "cache.numtide.com-1:GF3TabtFocLtonIGfz3PD61AgIO8GmjCYhEAmYy4VPY="
+      extra-trusted-public-keys = [
         "cache.thalheim.io-1:R7msbosLEZKrxk/lKxf9BTjOOH7Ax3H0Qj0/6wiHOgc="
         "flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs="
+        "niks3.numtide.com-1:DTx8wZduET09hRmMtKdQDxNNthLQETkc/yaX7M4qK0g="
         "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
       ];
       trusted-users = [
diff --git a/modules/hosts/nixos/default.nix b/modules/hosts/nixos/default.nix
index 5e57257..6a3834f 100644
--- a/modules/hosts/nixos/default.nix
+++ b/modules/hosts/nixos/default.nix
@@ -55,20 +55,18 @@
       "flakes"
       "nix-command"
     ];
-    substituters = [
-      "https://cache.nixos.org" # default one
+    extra-substituters = [
       "https://cache.flox.dev"
       "https://cache.numtide.com"
       "https://cache.thalheim.io"
       "https://cosmic.cachix.org/"
       "https://nix-community.cachix.org"
     ];
-    trusted-public-keys = [
-      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=" # default one
-      "cache.numtide.com-1:GF3TabtFocLtonIGfz3PD61AgIO8GmjCYhEAmYy4VPY="
+    extra-trusted-public-keys = [
       "cache.thalheim.io-1:R7msbosLEZKrxk/lKxf9BTjOOH7Ax3H0Qj0/6wiHOgc="
       "cosmic.cachix.org-1:Dya9IyXD4xdBehWjrkPv6rtxpmMdRel02smYzA85dPE="
       "flox-cache-public-1:7F4OyH7ZCnFhcze3fJdfyXYLQw/aV7GEed86nQ7IsOs="
+      "niks3.numtide.com-1:DTx8wZduET09hRmMtKdQDxNNthLQETkc/yaX7M4qK0g="
       "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
     ];
     trusted-users = [ "${username}" ];