diff --git a/pyproject.toml b/pyproject.toml
index 54a54da040916..1b2cc33512ab3 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -300,12 +300,13 @@ markers = [
     "integration: marks tests requiring external services (API keys, Modal, etc.)",
     "real_concurrent_gate: opt out of the autouse stub that disables _detect_concurrent_hermes_instances",
 ]
-# pytest-timeout: per-test 30s hard cap with signal method.
+# pytest-timeout: per-test 30s hard cap.
 # This is the fallback inside each per-file pytest subprocess (see
 # scripts/run_tests_parallel.py). Per-file isolation gives every test
 # file a fresh Python interpreter; pytest-timeout catches Python-level
-# hangs within a file.
-addopts = "-m 'not integration' --timeout=30 --timeout-method=signal"
+# hangs within a file. Leave the timeout method unset so pytest-timeout can
+# choose a platform-safe default (signal on POSIX, thread on Windows).
+addopts = "-m 'not integration' --timeout=30"
 
 [tool.ty.environment]
 python-version = "3.13"