diff --git a/shared/base.nix b/shared/base.nix
index 13c543d..d84c8b4 100644
--- a/shared/base.nix
+++ b/shared/base.nix
@@ -153,6 +153,8 @@
           "flakes"
         ];
         auto-optimise-store = true;
+        substituters = [ "https://cache.sinerva.eu" ];
+        trusted-public-keys = [ "cache.sinerva.eu:TaIhyAKozO/r88EBWMSdbp+TB0YlcXT/EADunYoYLVc=" ];
       };
       gc = {
         automatic = true;