diff --git a/default.nix b/default.nix
index d4f942b..a34f566 100644
--- a/default.nix
+++ b/default.nix
@@ -1,6 +1,6 @@
 { ... }:
 let
-  pkgs = (import <nixpkgs> {});
+  pkgs = (import <nixpkgs> { config.allowUnfree = true; });
 in {
   mongodb-4_4 = pkgs.mongodb-4_4;
 }