diff --git a/tests/test_approval_timeout_field.py b/tests/test_approval_timeout_field.py
index e223fe9..4fe25bf 100644
--- a/tests/test_approval_timeout_field.py
+++ b/tests/test_approval_timeout_field.py
@@ -198,23 +198,28 @@ def test_env_fallback_when_server_value_is_zero(self):
         # wait thread occasionally missed the 50ms release window
         # when the main thread was mid-test-collection, and the
         # entry stayed empty so ``result_box.get("result")`` was
-        # None. Two fixes applied together:
+        # None. Three fixes applied together:
         #
-        # 1. ``@pytest.mark.rerunfailures(reruns=2)`` (dev plugin
+        # 1. ``@pytest.mark.rerunfailures(reruns=4)`` (dev plugin
         #    pytest-rerunfailures>=14.0,<16.0) retries the flaky
-        #    inner helper up to 2 times.
-        # 2. ``release_after_ms=200`` widens the release window
-        #    from 50ms to 200ms — still well below the 120s env
-        #    default timeout so the test runs fast on CI, but
-        #    enough headroom that the spawned thread reliably
-        #    reaches ``event.wait()`` before the release fires.
-        @pytest.mark.rerunfailures(reruns=2)
+        #    inner helper up to 4 times — the post-merge push-CI
+        #    coverage job exhausted the previous ``reruns=2``
+        #    budget on 2026-08-04 because the spawned wait
+        #    thread missed the 200ms release window twice in a
+        #    row on the shared Linux runner.
+        # 2. ``release_after_ms=400`` widens the release window
+        #    from 200ms (Sprint 0) to 400ms — still well below
+        #    the 120s env default timeout so the test runs fast
+        #    on CI, but enough headroom that the spawned thread
+        #    reliably reaches ``event.wait()`` before the release
+        #    fires even on a contended runner.
+        @pytest.mark.rerunfailures(reruns=4)
         def _check_zero(bad_value: float) -> None:
             rt = _make_runtime(env_timeout=120.0)
             try:
                 result_box = _run_wait_and_release(
                     rt, "appr-zero", timeout_seconds=bad_value,
-                    release_after_ms=200,
+                    release_after_ms=400,
                 )
                 assert result_box.get("result") is not None
                 assert result_box["result"]["timeout_seconds"] == 120.0, (