diff --git a/pkgs/development/python-modules/freenub/default.nix b/pkgs/development/python-modules/freenub/default.nix
index f138d0a7fade..ee075de2559b 100644
--- a/pkgs/development/python-modules/freenub/default.nix
+++ b/pkgs/development/python-modules/freenub/default.nix
@@ -35,6 +35,8 @@ buildPythonPackage rec {
     requests
   ];
 
+  pythonRelaxDeps = [ "cbor2" ];
+
   nativeCheckInputs = [
     busypie
     pytest-asyncio