diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 00000000..43b5b00b
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,14 @@
+[pytest]
+filterwarnings =
+    # treat all warnings as errors
+    error
+    # Remove once https://github.com/protocolbuffers/protobuf/issues/12186 is fixed
+    ignore:.*custom tp_new.*in Python 3.14:DeprecationWarning
+    # Remove once https://github.com/grpc/grpc/issues/35086 is fixed
+    ignore:There is no current event loop:DeprecationWarning:grpc.aio._channel
+    # Remove once the minimum version of `googleapis-common-protos` in setup.py
+    # is 1.62.0
+    ignore:.*pkg_resources.declare_namespace:DeprecationWarning
+    ignore:.*pkg_resources is deprecated as an API:DeprecationWarning
+    # Remove warning once https://github.com/googleapis/gapic-generator-python/issues/1939 is fixed
+    ignore:get_mtls_endpoint_and_cert_source is deprecated.:DeprecationWarning