diff --git a/pyproject.toml b/pyproject.toml
index 0132afe05..037e20b2d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -110,4 +110,10 @@ filterwarnings = [
   "ignore:There is no current event loop:DeprecationWarning",
   # Remove after support for Python 3.7 is dropped
   "ignore:After January 1, 2024, new releases of this library will drop support for Python 3.7:DeprecationWarning",
+  # Remove after support for Python 3.10 is dropped
+  "ignore:.*You are using a.* Python version \\(3\\.10:FutureWarning",
+  # Remove after support for Python 3.11 is dropped
+  "ignore:.*You are using a.* Python version \\(3\\.11:FutureWarning",
+  # Remove after support for Python 3.12 is dropped
+  "ignore:.*You are using a.* Python version \\(3\\.12:FutureWarning",
 ]
diff --git a/tests/asyncio/gapic/test_method_async.py b/tests/asyncio/gapic/test_method_async.py
index 3edf8b6d4..40dd168a0 100644
--- a/tests/asyncio/gapic/test_method_async.py
+++ b/tests/asyncio/gapic/test_method_async.py
@@ -260,7 +260,7 @@ async def test_wrap_method_with_overriding_timeout_as_a_number():
     actual_timeout = method.call_args[1]["timeout"]
     metadata = method.call_args[1]["metadata"]
     assert metadata == mock.ANY
-    assert actual_timeout == pytest.approx(22, abs=0.01)
+    assert actual_timeout == pytest.approx(22, abs=0.05)
 
 
 @pytest.mark.asyncio
diff --git a/tests/asyncio/test_grpc_helpers_async.py b/tests/asyncio/test_grpc_helpers_async.py
index aa8d5d10b..3fffd070b 100644
--- a/tests/asyncio/test_grpc_helpers_async.py
+++ b/tests/asyncio/test_grpc_helpers_async.py
@@ -522,11 +522,15 @@ def test_create_channel_explicit_with_duplicate_credentials():
     target = "example:443"
 
     with pytest.raises(exceptions.DuplicateCredentialArgs) as excinfo:
-        grpc_helpers_async.create_channel(
-            target,
-            credentials_file="credentials.json",
-            credentials=mock.sentinel.credentials,
-        )
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        with pytest.warns(DeprecationWarning):
+            grpc_helpers_async.create_channel(
+                target,
+                credentials_file="credentials.json",
+                credentials=mock.sentinel.credentials,
+            )
 
     assert "mutually exclusive" in str(excinfo.value)
 
@@ -641,9 +645,13 @@ def test_create_channel_with_credentials_file(
     credentials_file = "/path/to/credentials/file.json"
     composite_creds = composite_creds_call.return_value
 
-    channel = grpc_helpers_async.create_channel(
-        target, credentials_file=credentials_file
-    )
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        channel = grpc_helpers_async.create_channel(
+            target, credentials_file=credentials_file
+        )
 
     google.auth.load_credentials_from_file.assert_called_once_with(
         credentials_file, scopes=None, default_scopes=None
@@ -670,9 +678,13 @@ def test_create_channel_with_credentials_file_and_scopes(
     credentials_file = "/path/to/credentials/file.json"
     composite_creds = composite_creds_call.return_value
 
-    channel = grpc_helpers_async.create_channel(
-        target, credentials_file=credentials_file, scopes=scopes
-    )
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        channel = grpc_helpers_async.create_channel(
+            target, credentials_file=credentials_file, scopes=scopes
+        )
 
     google.auth.load_credentials_from_file.assert_called_once_with(
         credentials_file, scopes=scopes, default_scopes=None
@@ -699,9 +711,13 @@ def test_create_channel_with_credentials_file_and_default_scopes(
     credentials_file = "/path/to/credentials/file.json"
     composite_creds = composite_creds_call.return_value
 
-    channel = grpc_helpers_async.create_channel(
-        target, credentials_file=credentials_file, default_scopes=default_scopes
-    )
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        channel = grpc_helpers_async.create_channel(
+            target, credentials_file=credentials_file, default_scopes=default_scopes
+        )
 
     google.auth.load_credentials_from_file.assert_called_once_with(
         credentials_file, scopes=None, default_scopes=default_scopes
diff --git a/tests/unit/operations_v1/test_operations_rest_client.py b/tests/unit/operations_v1/test_operations_rest_client.py
index 4e8ef4073..7fb26e18f 100644
--- a/tests/unit/operations_v1/test_operations_rest_client.py
+++ b/tests/unit/operations_v1/test_operations_rest_client.py
@@ -369,7 +369,11 @@ def test_operations_client_client_options(
         )
 
     # Check the case credentials_file is provided
-    options = client_options.ClientOptions(credentials_file="credentials.json")
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        options = client_options.ClientOptions(credentials_file="credentials.json")
     with mock.patch.object(transport_class, "__init__") as patched:
         patched.return_value = None
         client = client_class(client_options=options, transport=transport_name)
@@ -539,11 +543,25 @@ def test_operations_client_client_options_credentials_file(
     client_class, transport_class, transport_name
 ):
     # Check the case credentials file is provided.
-    options = client_options.ClientOptions(credentials_file="credentials.json")
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        options = client_options.ClientOptions(credentials_file="credentials.json")
     if "async" in str(client_class):
-        # TODO(): Add support for credentials file to async REST transport.
-        with pytest.raises(core_exceptions.AsyncRestUnsupportedParameterError):
-            client_class(client_options=options, transport=transport_name)
+        with mock.patch.object(transport_class, "__init__") as patched:
+            patched.return_value = None
+            client = client_class(client_options=options, transport=transport_name)
+            patched.assert_called_once_with(
+                credentials=None,
+                credentials_file="credentials.json",
+                host=client.DEFAULT_ENDPOINT,
+                scopes=None,
+                client_cert_source_for_mtls=None,
+                quota_project_id=None,
+                client_info=transports.base.DEFAULT_CLIENT_INFO,
+                always_use_jwt_access=True,
+            )
     else:
         with mock.patch.object(transport_class, "__init__") as patched:
             patched.return_value = None
@@ -570,10 +588,20 @@ def test_operations_client_client_options_credentials_file(
     return_value=(mock.sentinel.credentials, mock.sentinel.project),
 )
 def test_list_operations_rest(google_auth_default, credentials_file):
-    sync_transport = transports.rest.OperationsRestTransport(
-        credentials_file=credentials_file,
-        http_options=HTTP_OPTIONS,
-    )
+    if credentials_file is not None:
+        with pytest.warns(DeprecationWarning):
+            # The `credentials_file` argument is deprecated by
+            # the Google Cloud Auth library (`google-auth`), which is the
+            # upstream dependency responsible for handling authentication.
+            sync_transport = transports.rest.OperationsRestTransport(
+                credentials_file=credentials_file,
+                http_options=HTTP_OPTIONS,
+            )
+    else:
+        sync_transport = transports.rest.OperationsRestTransport(
+            credentials_file=credentials_file,
+            http_options=HTTP_OPTIONS,
+        )
 
     client = AbstractOperationsClient(transport=sync_transport)
 
@@ -1130,10 +1158,14 @@ def test_transport_adc(client_class, transport_class, credentials):
 def test_operations_base_transport_error():
     # Passing both a credentials object and credentials_file should raise an error
     with pytest.raises(core_exceptions.DuplicateCredentialArgs):
-        transports.OperationsTransport(
-            credentials=ga_credentials.AnonymousCredentials(),
-            credentials_file="credentials.json",
-        )
+        with pytest.warns(DeprecationWarning):
+            # The `credentials_file` argument is deprecated by
+            # the Google Cloud Auth library (`google-auth`), which is the
+            # upstream dependency responsible for handling authentication.
+            transports.OperationsTransport(
+                credentials=ga_credentials.AnonymousCredentials(),
+                credentials_file="credentials.json",
+            )
 
 
 def test_operations_base_transport():
@@ -1171,10 +1203,14 @@ def test_operations_base_transport_with_credentials_file():
     ) as Transport:
         Transport.return_value = None
         load_creds.return_value = (ga_credentials.AnonymousCredentials(), None)
-        transports.OperationsTransport(
-            credentials_file="credentials.json",
-            quota_project_id="octopus",
-        )
+        with pytest.warns(DeprecationWarning):
+            # The `credentials_file` argument is deprecated by
+            # the Google Cloud Auth library (`google-auth`), which is the
+            # upstream dependency responsible for handling authentication.
+            transports.OperationsTransport(
+                credentials_file="credentials.json",
+                quota_project_id="octopus",
+            )
         load_creds.assert_called_once_with(
             "credentials.json",
             scopes=None,
diff --git a/tests/unit/test_client_options.py b/tests/unit/test_client_options.py
index 396d66271..0dccd9d99 100644
--- a/tests/unit/test_client_options.py
+++ b/tests/unit/test_client_options.py
@@ -27,19 +27,22 @@ def get_client_encrypted_cert():
 
 
 def test_constructor():
-
-    options = client_options.ClientOptions(
-        api_endpoint="foo.googleapis.com",
-        client_cert_source=get_client_cert,
-        quota_project_id="quote-proj",
-        credentials_file="path/to/credentials.json",
-        scopes=[
-            "https://www.googleapis.com/auth/cloud-platform",
-            "https://www.googleapis.com/auth/cloud-platform.read-only",
-        ],
-        api_audience="foo2.googleapis.com",
-        universe_domain="googleapis.com",
-    )
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        options = client_options.ClientOptions(
+            api_endpoint="foo.googleapis.com",
+            client_cert_source=get_client_cert,
+            quota_project_id="quote-proj",
+            credentials_file="path/to/credentials.json",
+            scopes=[
+                "https://www.googleapis.com/auth/cloud-platform",
+                "https://www.googleapis.com/auth/cloud-platform.read-only",
+            ],
+            api_audience="foo2.googleapis.com",
+            universe_domain="googleapis.com",
+        )
 
     assert options.api_endpoint == "foo.googleapis.com"
     assert options.client_cert_source() == (b"cert", b"key")
@@ -102,10 +105,14 @@ def test_constructor_with_api_key():
 
 def test_constructor_with_both_api_key_and_credentials_file():
     with pytest.raises(ValueError):
-        client_options.ClientOptions(
-            api_key="api-key",
-            credentials_file="path/to/credentials.json",
-        )
+        with pytest.warns(DeprecationWarning):
+            # The `credentials_file` argument is deprecated by
+            # the Google Cloud Auth library (`google-auth`), which is the
+            # upstream dependency responsible for handling authentication.
+            client_options.ClientOptions(
+                api_key="api-key",
+                credentials_file="path/to/credentials.json",
+            )
 
 
 def test_from_dict():
diff --git a/tests/unit/test_grpc_helpers.py b/tests/unit/test_grpc_helpers.py
index 8de9d8c0b..9d7bb9c04 100644
--- a/tests/unit/test_grpc_helpers.py
+++ b/tests/unit/test_grpc_helpers.py
@@ -581,11 +581,15 @@ def test_create_channel_explicit_with_duplicate_credentials():
     target = "example.com:443"
 
     with pytest.raises(exceptions.DuplicateCredentialArgs):
-        grpc_helpers.create_channel(
-            target,
-            credentials_file="credentials.json",
-            credentials=mock.sentinel.credentials,
-        )
+        with pytest.warns(DeprecationWarning):
+            # The `credentials_file` argument is deprecated by
+            # the Google Cloud Auth library (`google-auth`), which is the
+            # upstream dependency responsible for handling authentication.
+            grpc_helpers.create_channel(
+                target,
+                credentials_file="credentials.json",
+                credentials=mock.sentinel.credentials,
+            )
 
 
 @mock.patch("grpc.compute_engine_channel_credentials")
@@ -710,7 +714,11 @@ def test_create_channel_with_credentials_file(
     credentials_file = "/path/to/credentials/file.json"
     composite_creds = composite_creds_call.return_value
 
-    channel = grpc_helpers.create_channel(target, credentials_file=credentials_file)
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        channel = grpc_helpers.create_channel(target, credentials_file=credentials_file)
 
     google.auth.load_credentials_from_file.assert_called_once_with(
         credentials_file, scopes=None, default_scopes=None
@@ -742,9 +750,13 @@ def test_create_channel_with_credentials_file_and_scopes(
     credentials_file = "/path/to/credentials/file.json"
     composite_creds = composite_creds_call.return_value
 
-    channel = grpc_helpers.create_channel(
-        target, credentials_file=credentials_file, scopes=scopes
-    )
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        channel = grpc_helpers.create_channel(
+            target, credentials_file=credentials_file, scopes=scopes
+        )
 
     google.auth.load_credentials_from_file.assert_called_once_with(
         credentials_file, scopes=scopes, default_scopes=None
@@ -776,9 +788,13 @@ def test_create_channel_with_credentials_file_and_default_scopes(
     credentials_file = "/path/to/credentials/file.json"
     composite_creds = composite_creds_call.return_value
 
-    channel = grpc_helpers.create_channel(
-        target, credentials_file=credentials_file, default_scopes=default_scopes
-    )
+    with pytest.warns(DeprecationWarning):
+        # The `credentials_file` argument is deprecated by
+        # the Google Cloud Auth library (`google-auth`), which is the
+        # upstream dependency responsible for handling authentication.
+        channel = grpc_helpers.create_channel(
+            target, credentials_file=credentials_file, default_scopes=default_scopes
+        )
 
     load_credentials_from_file.assert_called_once_with(
         credentials_file, scopes=None, default_scopes=default_scopes