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