diff --git a/flake.nix b/flake.nix
index 06e6bf6..ae546f9 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,6 +11,11 @@
     t3code.flake = false;
   };
 
+  nixConfig = {
+    extra-substituters = ["https://cache.numtide.com"];
+    extra-trusted-public-keys = ["niks3.numtide.com-1:DTx8wZduET09hRmMtKdQDxNNthLQETkc/yaX7M4qK0g="];
+  };
+
   outputs = {
     self,
     llm-agents,