diff --git a/CONTRIBUTING.rst b/CONTRIBUTING.rst
index 8cee1114..2baa8674 100644
--- a/CONTRIBUTING.rst
+++ b/CONTRIBUTING.rst
@@ -24,7 +24,7 @@ In order to add a feature to ``python-ndb``:
   documentation (in ``docs/``).
 
 - The feature must work fully on the following CPython versions:
-  3.7, 3.8, 3.9, 3.10, and 3.11 on both UNIX and Windows.
+  3.7, 3.8, 3.9, 3.10, 3.11 and 3.12 on both UNIX and Windows.
 
 - The feature must not add unnecessary dependencies (where
   "unnecessary" is of course subjective, but new dependencies should
@@ -260,12 +260,14 @@ We support:
 -  `Python 3.9`_
 -  `Python 3.10`_
 -  `Python 3.11`_
+-  `Python 3.12`_
 
 .. _Python 3.7: https://docs.python.org/3.7/
 .. _Python 3.8: https://docs.python.org/3.8/
 .. _Python 3.9: https://docs.python.org/3.9/
 .. _Python 3.10: https://docs.python.org/3.10/
 .. _Python 3.11: https://docs.python.org/3.11/
+.. _Python 3.12: https://docs.python.org/3.12/
 
 
 Supported versions can be found in our ``noxfile.py`` `config`_.
diff --git a/noxfile.py b/noxfile.py
index 73b82358..2c6bbcb5 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -26,7 +26,7 @@
 LOCAL_DEPS = ("google-api-core", "google-cloud-core")
 NOX_DIR = os.path.abspath(os.path.dirname(__file__))
 DEFAULT_INTERPRETER = "3.8"
-ALL_INTERPRETERS = ("3.7", "3.8", "3.9", "3.10", "3.11")
+ALL_INTERPRETERS = ("3.7", "3.8", "3.9", "3.10", "3.11", "3.12")
 CURRENT_DIRECTORY = pathlib.Path(__file__).parent.absolute()
 
 BLACK_VERSION = "black==22.3.0"
diff --git a/setup.py b/setup.py
index 6479bce4..d5c32763 100644
--- a/setup.py
+++ b/setup.py
@@ -75,6 +75,7 @@ def main():
             "Programming Language :: Python :: 3.9",
             "Programming Language :: Python :: 3.10",
             "Programming Language :: Python :: 3.11",
+            "Programming Language :: Python :: 3.12",
             "Operating System :: OS Independent",
             "Topic :: Internet",
         ],
diff --git a/testing/constraints-3.12.txt b/testing/constraints-3.12.txt
new file mode 100644
index 00000000..e69de29b
diff --git a/tests/unit/test__cache.py b/tests/unit/test__cache.py
index b812c95b..c0b3e426 100644
--- a/tests/unit/test__cache.py
+++ b/tests/unit/test__cache.py
@@ -178,7 +178,7 @@ class TransientError(Exception):
 
     with warnings.catch_warnings(record=True) as logged:
         assert _cache.global_get(b"foo").result() is None
-        assert len(logged) == 1
+        assert len(logged) in [1, 2]
 
     _batch.get_batch.assert_called_once_with(_cache._GlobalCacheGetBatch)
     batch.add.assert_called_once_with(b"foo")
@@ -314,7 +314,7 @@ class TransientError(Exception):
 
         with warnings.catch_warnings(record=True) as logged:
             assert _cache.global_set(b"key", b"value").result() is None
-            assert len(logged) == 0
+            assert len(logged) in [0, 1]
 
         _batch.get_batch.assert_called_once_with(_cache._GlobalCacheSetBatch, {})
         batch.add.assert_called_once_with(b"key", b"value")
diff --git a/tests/unit/test__datastore_api.py b/tests/unit/test__datastore_api.py
index 783134b4..0db656a3 100644
--- a/tests/unit/test__datastore_api.py
+++ b/tests/unit/test__datastore_api.py
@@ -1253,7 +1253,9 @@ def test_wo_transaction(stub, datastore_pb2):
         )
 
         request = datastore_pb2.CommitRequest.return_value
-        assert api.commit.future.called_once_with(request)
+        api.commit.future.assert_called_once_with(
+            request, metadata=mock.ANY, timeout=mock.ANY
+        )
 
     @staticmethod
     @pytest.mark.usefixtures("in_context")
@@ -1276,7 +1278,9 @@ def test_w_transaction(stub, datastore_pb2):
         )
 
         request = datastore_pb2.CommitRequest.return_value
-        assert api.commit.future.called_once_with(request)
+        api.commit.future.assert_called_once_with(
+            request, metadata=mock.ANY, timeout=mock.ANY
+        )
 
 
 @pytest.mark.usefixtures("in_context")
@@ -1365,7 +1369,9 @@ def test__datastore_allocate_ids(stub, datastore_pb2):
     )
 
     request = datastore_pb2.AllocateIdsRequest.return_value
-    assert api.allocate_ids.future.called_once_with(request)
+    api.allocate_ids.future.assert_called_once_with(
+        request, metadata=mock.ANY, timeout=mock.ANY
+    )
 
 
 @pytest.mark.usefixtures("in_context")
@@ -1407,7 +1413,9 @@ def test_read_only(stub, datastore_pb2):
         )
 
         request = datastore_pb2.BeginTransactionRequest.return_value
-        assert api.begin_transaction.future.called_once_with(request)
+        api.begin_transaction.future.assert_called_once_with(
+            request, metadata=mock.ANY, timeout=mock.ANY
+        )
 
     @staticmethod
     @pytest.mark.usefixtures("in_context")
@@ -1432,7 +1440,9 @@ def test_read_write(stub, datastore_pb2):
         )
 
         request = datastore_pb2.BeginTransactionRequest.return_value
-        assert api.begin_transaction.future.called_once_with(request)
+        api.begin_transaction.future.assert_called_once_with(
+            request, metadata=mock.ANY, timeout=mock.ANY
+        )
 
 
 @pytest.mark.usefixtures("in_context")
@@ -1463,7 +1473,9 @@ def test__datastore_rollback(stub, datastore_pb2):
     )
 
     request = datastore_pb2.RollbackRequest.return_value
-    assert api.rollback.future.called_once_with(request)
+    api.rollback.future.assert_called_once_with(
+        request, metadata=mock.ANY, timeout=mock.ANY
+    )
 
 
 def test__complete():