diff --git a/pkgs/development/python-modules/jax/default.nix b/pkgs/development/python-modules/jax/default.nix
index dbdf655e4007..25ff005569a5 100644
--- a/pkgs/development/python-modules/jax/default.nix
+++ b/pkgs/development/python-modules/jax/default.nix
@@ -12,6 +12,7 @@
 , numpy
 , opt-einsum
 , pytestCheckHook
+, pytest-xdist
 , pythonOlder
 , scipy
 , stdenv
@@ -61,13 +62,18 @@ buildPythonPackage rec {
     jaxlib'
     matplotlib
     pytestCheckHook
+    pytest-xdist
   ];
 
+  # high parallelism will result in the tests getting stuck
+  dontUsePytestXdist = true;
+
   # NOTE: Don't run the tests in the expiremental directory as they require flax
   # which creates a circular dependency. See https://discourse.nixos.org/t/how-to-nix-ify-python-packages-with-circular-dependencies/14648/2.
   # Not a big deal, this is how the JAX docs suggest running the test suite
   # anyhow.
   pytestFlagsArray = [
+    "--numprocesses=4"
     "-W ignore::DeprecationWarning"
     "tests/"
   ];