diff --git a/pkgs/development/python-modules/narwhals/default.nix b/pkgs/development/python-modules/narwhals/default.nix
index 6b39d0a016a3..c37327e9ea01 100644
--- a/pkgs/development/python-modules/narwhals/default.nix
+++ b/pkgs/development/python-modules/narwhals/default.nix
@@ -16,6 +16,7 @@
   pyarrow,
   pyspark,
   pytest-env,
+  pytest-xdist,
   pytestCheckHook,
   rich,
   sqlframe,
@@ -76,6 +77,7 @@ buildPythonPackage rec {
     duckdb
     hypothesis
     pytest-env
+    pytest-xdist
     pytestCheckHook
   ]
   ++ lib.concatAttrValues optional-dependencies;