diff --git a/pkgs/by-name/pd/pdm/package.nix b/pkgs/by-name/pd/pdm/package.nix
index a7b7f26f17a9..b8b43dc9f7f3 100644
--- a/pkgs/by-name/pd/pdm/package.nix
+++ b/pkgs/by-name/pd/pdm/package.nix
@@ -22,6 +22,8 @@ python3.pkgs.buildPythonApplication rec {
     hash = "sha256-xgwIPHlTtmgCNN4R6/BJsqmI9hbA0wFAiq4YCa+r/UM=";
   };
 
+  pythonRelaxDeps = [ "hishel" ];
+
   nativeBuildInputs = [ installShellFiles ];
 
   build-system = with python3.pkgs; [