diff --git a/pkgs/development/python-modules/blackjax/default.nix b/pkgs/development/python-modules/blackjax/default.nix
index 4e47e692657a..f9521db79cb8 100644
--- a/pkgs/development/python-modules/blackjax/default.nix
+++ b/pkgs/development/python-modules/blackjax/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , pythonOlder
 , fetchFromGitHub
+, pytest-xdist
 , pytestCheckHook
 , setuptools-scm
 , fastprogress
@@ -14,16 +15,16 @@
 
 buildPythonPackage rec {
   pname = "blackjax";
-  version = "1.0.0";
+  version = "1.1.0";
   pyproject = true;
 
-  disabled = pythonOlder "3.8";
+  disabled = pythonOlder "3.9";
 
   src = fetchFromGitHub {
     owner = "blackjax-devs";
-    repo = pname;
+    repo = "blackjax";
     rev = "refs/tags/${version}";
-    hash = "sha256-hqOKSHyZ/BmOu6MJLeecD3H1BbLbZqywmlBzn3xjQRk=";
+    hash = "sha256-VAsCDI0rEqx0UJlD82wbZ8KuMi6LOjUlO6YzqnOfAGk=";
   };
 
   nativeBuildInputs = [ setuptools-scm ];
@@ -39,7 +40,10 @@ buildPythonPackage rec {
     typing-extensions
   ];
 
-  nativeCheckInputs = [ pytestCheckHook ];
+  nativeCheckInputs = [
+    pytestCheckHook
+    pytest-xdist
+  ];
   disabledTestPaths = [ "tests/test_benchmarks.py" ];
   disabledTests = [
     # too slow
diff --git a/pkgs/development/python-modules/jaxopt/default.nix b/pkgs/development/python-modules/jaxopt/default.nix
index 36a43027231d..0f0e396b906d 100644
--- a/pkgs/development/python-modules/jaxopt/default.nix
+++ b/pkgs/development/python-modules/jaxopt/default.nix
@@ -2,6 +2,7 @@
 , buildPythonPackage
 , pythonOlder
 , fetchFromGitHub
+, pytest-xdist
 , pytestCheckHook
 , absl-py
 , cvxpy
@@ -16,7 +17,7 @@
 
 buildPythonPackage rec {
   pname = "jaxopt";
-  version = "0.8.2";
+  version = "0.8.3";
   format = "setuptools";
 
   disabled = pythonOlder "3.8";
@@ -25,7 +26,7 @@ buildPythonPackage rec {
     owner = "google";
     repo = "jaxopt";
     rev = "refs/tags/jaxopt-v${version}";
-    hash = "sha256-uVOd3knoku5fKBNXOhCikGtjDuW3TtRqev94OM/8Pgk=";
+    hash = "sha256-T/BHSnuk3IRuLkBj3Hvb/tFIb7Au25jjQtvwL28OU1U=";
   };
 
   propagatedBuildInputs = [
@@ -38,6 +39,7 @@ buildPythonPackage rec {
   ];
 
   nativeCheckInputs = [
+    pytest-xdist
     pytestCheckHook
     cvxpy
     optax
@@ -52,11 +54,6 @@ buildPythonPackage rec {
     "jaxopt.tree_util"
   ];
 
-  disabledTests = [
-    # Stack frame issue
-    "test_bisect"
-  ];
-
   meta = with lib; {
     homepage = "https://jaxopt.github.io";
     description = "Hardware accelerated, batchable and differentiable optimizers in JAX";