diff --git a/nix.nix b/nix.nix
index 148835b..c2dff0d 100644
--- a/nix.nix
+++ b/nix.nix
@@ -7,8 +7,14 @@
       ];
       download-buffer-size = 2 * 1024 * 1024 * 1024;
       warn-dirty = false;
+      substituters = [
+        "https://cache.nixos.org"
+        "https://nix-community.cachix.org?priority=45"
+        "http://tower:5000?priority=50"
+      ];
       trusted-public-keys = [
         "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
         "matej.nix-1:TdbemLVYblvAxqJcwb3mVKmmr3cfzXbMcZHE5ILnZDE="
       ];
     };