diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 85e8d4a4..304f107e 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -36,4 +36,4 @@ jobs:
           pip install '.[test]'
       - name: Run the tests with pytest
         run: |
-          python -m pytest --cov=posteriors --cov-report term-missing
\ No newline at end of file
+          python -m pytest -n auto --cov=posteriors --cov-report term-missing
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index a15686a6..eda2786c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,7 +17,7 @@ classifiers = [
 dependencies = ["torch>=2.0.0", "torchopt>=0.7.3", "optree>=0.10.0"]
 
 [project.optional-dependencies]
-test = ["pre-commit", "pytest-cov", "ruff"]
+test = ["pre-commit", "pytest-cov", "pytest-xdist", "ruff"]
 docs = ["mkdocs", "mkdocs-material", "mkdocstrings[python]"]
 
 [tool.setuptools]
@@ -33,6 +33,7 @@ packages = [
 [tool.ruff.lint.per-file-ignores]
 "__init__.py" = ["F401", "F821", "E402"]
 
+
 [build-system]
 requires = ["setuptools>=64"]
 build-backend = "setuptools.build_meta"
\ No newline at end of file