diff --git a/profiles/core.nix b/profiles/core.nix
index 6fb7510..7690326 100644
--- a/profiles/core.nix
+++ b/profiles/core.nix
@@ -41,6 +41,11 @@
 
         min-free = 4 * 1024 * 1024 * 1024;
         max-free = 6 * 1024 * 1024 * 1024;
+
+        substituters = [ "https://sebastian-stork.cachix.org" ];
+        trusted-public-keys = [
+          "sebastian-stork.cachix.org-1:PAgwmtq5BF/UlUoXdBC2sX2EKZQ2vCjo3iGySujbaME="
+        ];
       };
     };