diff --git a/dev_tools/conftest.py b/dev_tools/conftest.py
index 2e7bb5fc556..708c77a3347 100644
--- a/dev_tools/conftest.py
+++ b/dev_tools/conftest.py
@@ -11,6 +11,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 import os
 import shutil
 import sys
@@ -18,6 +19,7 @@
 import uuid
 from pathlib import Path
 from typing import Tuple
+from unittest import mock
 
 import pytest
 from filelock import FileLock
@@ -26,6 +28,14 @@
 from dev_tools.env_tools import create_virtual_env
 
 
+@pytest.fixture(scope="session", autouse=True)
+def disable_local_gcloud_credentials(tmp_path_factory):
+    # Ensure tests cannot authenticate to production servers with user credentials
+    empty_dir = tmp_path_factory.mktemp("empty_gcloud_config", numbered=False)
+    with mock.patch.dict(os.environ, {"CLOUDSDK_CONFIG": str(empty_dir)}):
+        yield
+
+
 @pytest.fixture(scope="session")
 def cloned_env(testrun_uid, worker_id):
     """Fixture to allow tests to run in a clean virtual env.