diff --git a/pkgs/development/python-modules/pylitterbot/default.nix b/pkgs/development/python-modules/pylitterbot/default.nix
index add82ecc2d15..dcd863d08bfc 100644
--- a/pkgs/development/python-modules/pylitterbot/default.nix
+++ b/pkgs/development/python-modules/pylitterbot/default.nix
@@ -28,6 +28,8 @@ buildPythonPackage rec {
     hash = "sha256-MSQdX2PKQohmPGqtRZnUmCCVgKgaf4+cHAUItiPv7pY=";
   };
 
+  pythonRelaxDeps = [ "deepdiff" ];
+
   build-system = [
     poetry-core
     poetry-dynamic-versioning