diff --git a/common/global/nix.nix b/common/global/nix.nix
index 46aa57f..89fb9e7 100644
--- a/common/global/nix.nix
+++ b/common/global/nix.nix
@@ -9,11 +9,12 @@
     # c3 runs ncps (Nix Cache Proxy Server) that caches cache.nixos.org
     # Falls back to cache.nixos.org if c3 is unreachable
     substituters = [
-      "http://c3:8501"  # Local ncps cache proxy on c3
+      "http://c3.mule-stork.ts.net:8501"  # Local ncps cache proxy on c3
       "https://cache.nixos.org"
     ];
     trusted-public-keys = [
       "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+      "c3:sI3l1RN80xdehzXLA8u2P6352B0SyRPs2XiYy/YWYro="
     ];
 
     # Performance tuning