diff --git a/default.nix b/default.nix
index e929e516..898ef442 100644
--- a/default.nix
+++ b/default.nix
@@ -65,6 +65,7 @@ in
         pkgs.openssh
         pkgs.httpie
         pkgs.jq
+        pkgs.diffutils
         pkgs.nix-unit
         test-loop
         nixops4.packages.${system}.default