diff --git a/nixos/tests/n8n.nix b/nixos/tests/n8n.nix
index 4d6ce0c0b2b7..56ffabaca1ed 100644
--- a/nixos/tests/n8n.nix
+++ b/nixos/tests/n8n.nix
@@ -10,9 +10,17 @@ in
     k900
   ];
 
+  node.pkgsReadOnly = false;
+
   nodes.machine =
-    { pkgs, ... }:
+    { ... }:
     {
+      nixpkgs.config.allowUnfreePredicate =
+        pkg:
+        builtins.elem (lib.getName pkg) [
+          "n8n"
+        ];
+
       services.n8n = {
         enable = true;
         webhookUrl = webhookUrl;