diff --git a/flake.nix b/flake.nix
index 1a347cce..68fffe1d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,6 +7,15 @@
     flake-utils.url = "github:numtide/flake-utils";
   };
 
+  nixConfig = {
+    extra-substituters = [
+      "https://cache.kyouma.net"
+    ];
+    extra-trusted-public-keys = [
+      "cache.kyouma.net:Frjwu4q1rnwE/MnSTmX9yx86GNA/z3p/oElGvucLiZg="
+    ];
+  };
+
   outputs = { self, nixpkgs, flake-utils, ... }: {
     hydraJobs = {
       inherit (self) packages;