diff --git a/common.nix b/common.nix
index 9511791..dea1241 100644
--- a/common.nix
+++ b/common.nix
@@ -11,6 +11,7 @@
 
   nix.binaryCaches = [ https://hydra.nixos.org https://cache.nixos.org ];
   nix.trustedBinaryCaches = [ https://hydra.nixos.org https://cache.nixos.org ];
+  nix.binaryCachePublicKeys = [ "hydra.nixos.org-1:CNHJZBh9K4tP3EKF6FkkgeVYsS3ohTl+oS0Qa8bezVs=" ];
   nix.extraOptions = "auto-optimise-store = true";
 
   networking.networkmanager.enable = true;