diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1c19e752e..9e6d752d7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         python: ["3.9", "3.13"]
-        os: [ubuntu-latest, ubuntu-arm, macos-intel, macos-arm, windows-latest]
+        os: [ubuntu-latest, ubuntu-arm, macos-intel, macos-arm, windows-2019]
         include:
           # On 3.9 there is a problem with import errors caused by pytests' loader that surface due
           # to a bug in CPython (https://github.com/python/cpython/issues/91351), so we avoid using
@@ -72,8 +72,7 @@ jobs:
       - run: poe test ${{matrix.pytestExtraArgs}} -s --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}.xml
         timeout-minutes: 10
       # Time skipping doesn't yet support ARM
-      - if: ${{ !endsWith(matrix.os, '-arm') }}
-        run: poe test ${{matrix.pytestExtraArgs}} -s --workflow-environment time-skipping --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}--time-skipping.xml
+      - run: poe test ${{matrix.pytestExtraArgs}} -s --workflow-environment time-skipping --junit-xml=junit-xml/${{ matrix.python }}--${{ matrix.os }}--time-skipping.xml
         timeout-minutes: 10
       # Check cloud if proper target and not on fork
       - if: ${{ matrix.cloudTestTarget && (github.event.pull_request.head.repo.full_name == '' || github.event.pull_request.head.repo.full_name == 'temporalio/sdk-python') }}
diff --git a/temporalio/testing/_workflow.py b/temporalio/testing/_workflow.py
index 85c5404ea..7afa4fe92 100644
--- a/temporalio/testing/_workflow.py
+++ b/temporalio/testing/_workflow.py
@@ -247,7 +247,7 @@ async def start_time_skipping(
         download_dest_dir: Optional[str] = None,
         runtime: Optional[temporalio.runtime.Runtime] = None,
         test_server_existing_path: Optional[str] = None,
-        test_server_download_version: str = "default",
+        test_server_download_version: str = "v1.29.0",
         test_server_extra_args: Sequence[str] = [],
         test_server_download_ttl: Optional[timedelta] = None,
     ) -> WorkflowEnvironment: