diff --git a/pyproject.toml b/pyproject.toml
index d7a4036..31f4a48 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -90,7 +90,7 @@ learned = [
 ]
 dev = [
     "pytest>=7.0",
-    "pytest-xdist>=3.0",
+    "pytest-xdist>=3.8.0",
     # pytest-asyncio is required by tests/test_taint_classifier.py — those
     # tests use ``@pytest.mark.asyncio`` to verify the MCP-sampling-based
     # taint classifier under a controlled async loop.