diff --git a/.github/workflows/pythonpackage.yml b/.github/workflows/pythonpackage.yml
@@ -13,7 +13,7 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
-        os: ["ubuntu-latest", "windows-latest"]
        python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]
        include:
        - experimental: false

diff --git a/test/test_util.py b/test/test_util.py
@@ -398,7 +398,9 @@ def test_blocking_lock_file(self):
        elapsed = time.time() - start
        extra_time = 0.02
        if os.name == "nt" or sys.platform == "cygwin":
-            extra_time *= 6  # NOTE: Indeterministic failures without this...
        self.assertLess(elapsed, wait_time + extra_time)

    def test_user_id(self):