diff --git a/flake.nix b/flake.nix
index c971800100c8183a4ddda7a16ce5e149e73e6842..463cdc4b0b34d782cf11a949a0c36dbbaa7b3e3e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,6 +2,11 @@
 
   description = "Horizon Haskell Platform";
 
+  nixConfig = {
+    extra-substituters = "https://horizon.cachix.org";
+    extra-trusted-public-keys = "horizon.cachix.org-1:MeEEDRhRZTgv/FFGCv3479/dmJDfJ82G6kfUDxMSAw0=";
+  };
+
   inputs = {
     get-flake.url = "github:ursi/get-flake";
     flake-parts.url = "github:hercules-ci/flake-parts";