diff --git a/ci.nix b/ci.nix
index 4846be96..89444502 100644
--- a/ci.nix
+++ b/ci.nix
@@ -14,6 +14,7 @@ in {
   cache.cachix.arc = {
     enable = true;
     publicKey = "arc.cachix.org-1:DZmhclLkB6UO0rc0rBzNpwFbbaeLfyn+fYccuAy7YVY=";
+    signingKey = null;
   };
   cache.cachix.kittywitch = {
     enable = true;