diff --git a/ci.nix b/ci.nix
index 2708d990..40de49ae 100644
--- a/ci.nix
+++ b/ci.nix
@@ -9,6 +9,10 @@
     run = "nix build -Lf . hosts.${host}.config.system.build.toplevel --show-trace";
   }));
   ci.gh-actions.checkoutOptions.submodules = false;
+  cache.cachix.arc = {
+    enable = true;
+    publicKey = "arc.cachix.org-1:DZmhclLkB6UO0rc0rBzNpwFbbaeLfyn+fYccuAy7YVY=";
+  };
   cache.cachix.kittywitch = {
     enable = true;
     publicKey = "kittywitch.cachix.org-1:KIzX/G5cuPw5WgrXad6UnrRZ8UDr7jhXzRTK/lmqyK0=";
diff --git a/profiles/common/nix.nix b/profiles/common/nix.nix
index c8aeba60..5729d0d1 100644
--- a/profiles/common/nix.nix
+++ b/profiles/common/nix.nix
@@ -13,6 +13,7 @@
       "nixpkgs-mozilla=${sources.nixpkgs-mozilla}"
       "NUR=${sources.NUR}"
       "arc=${sources.arc-nixexprs}"
+      "ci=${sources.ci}"
     ];
     binaryCaches = [ "https://arc.cachix.org" "https://kittywitch.cachix.org" ];
     binaryCachePublicKeys =