diff --git a/pkgs/development/python-modules/wapiti-arsenic/default.nix b/pkgs/development/python-modules/wapiti-arsenic/default.nix
index bf4f4f92bcc8..000ee16faa1d 100644
--- a/pkgs/development/python-modules/wapiti-arsenic/default.nix
+++ b/pkgs/development/python-modules/wapiti-arsenic/default.nix
@@ -22,6 +22,8 @@ buildPythonPackage rec {
     hash = "sha256-snIKEdrBOIfPeHkVLv0X5lsBzDbOtDrbOj4m8UNCj60=";
   };
 
+  pythonRelaxDeps = [ "packaging" ];
+
   postPatch = ''
     substituteInPlace pyproject.toml \
       --replace-fail "poetry>=2.1.3" "poetry-core" \