diff --git a/system/nix.nix b/system/nix.nix
index c754ddc..7354501 100644
--- a/system/nix.nix
+++ b/system/nix.nix
@@ -15,7 +15,7 @@
         "https://cache.nixos.org"
         "https://cuda-maintainers.cachix.org"
       ];
-      substituters = lib.mkDefault [
+      substituters = lib.mkOverride 90 [
         "https://nix-cache.home.2rjus.net"
         "https://cache.nixos.org"
         "https://cuda-maintainers.cachix.org"