diff --git a/tests/test_task.py b/tests/test_task.py
index 9a0c09cb..b67dce19 100644
--- a/tests/test_task.py
+++ b/tests/test_task.py
@@ -29,6 +29,10 @@ class TaskLifecycleTests(unittest.TestCase):
                     "TASK_PARENT_BRANCH", "TASK_PARENT_PR", "FORCE_ABANDON", "TASK_TARGET_BRANCH"):
             self.env.pop(key, None)
         self.git(self.root, "init", "--bare", "--initial-branch=main", str(self.remote))
+        # receive-pack 默认在后台跑 gc --auto，与 TemporaryDirectory 清理竞态
+        # （CI 实测 OSError 39 remote.git not empty）；夹具远端无留存价值，直接关。
+        self.git(self.remote, "config", "gc.auto", "0")
+        self.git(self.remote, "config", "receive.autogc", "false")
         self.git(self.root, "init", "--initial-branch=main", str(self.repo))
         shutil.copytree(SOURCE / "scripts", self.repo / "scripts")
         (self.repo / "Makefile").write_text("precheck:\n\t@bash scripts/task.sh precheck\n")