diff --git a/hosts/hydra/hydra.nix b/hosts/hydra/hydra.nix
index 276e39f5..b08ae188 100644
--- a/hosts/hydra/hydra.nix
+++ b/hosts/hydra/hydra.nix
@@ -23,7 +23,10 @@
           };
           extraOptions = ''
             allowed-uris = https://gitea.c3d2.de/ https://github.com/ https://gitlab.com/ ssh://gitea@gitea.c3d2.de/
+            builders-use-substitutes = true
             experimental-features = ca-derivations nix-command flakes
+            extra-substituters = https://cache.ngi0.nixos.org/
+            extra-trusted-public-keys = cache.ngi0.nixos.org-1:KqH5CBLNSyX184S9BKZJo1LxrxJ9ltnY2uAs5c/f1MA=
           '';
         };