diff --git a/pyproject.toml b/pyproject.toml
index 4580bc31..23b61430 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,7 +67,7 @@ dependencies = [
 # extras
 # https://peps.python.org/pep-0621/#dependencies-optional-dependencies
 [project.optional-dependencies]
-test = ["pytest", "pytest-cov", "pytest-lazy-fixtures"]
+test = ["pytest", "pytest-xdist", "pytest-cov", "pytest-lazy-fixtures"]
 dev = [
     "black",
     "mypy",