diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 99449fd0..a01200b6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -87,6 +87,7 @@ jobs:
             3.10
             3.11
             3.12
+            3.13
             pypy3.10
           allow-prereleases: true
       - name: Set up nox
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 0da30a6b..4c7c86e1 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,3 +1,8 @@
+v4.22.1
+=======
+
+* Declare support for Py3.13
+
 v4.22.0
 =======
 
diff --git a/noxfile.py b/noxfile.py
index 2c611278..fada3e1f 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -35,13 +35,13 @@
     "The Unlicense (Unlicense)",
 ]
 
-SUPPORTED = ["3.8", "3.9", "3.10", "pypy3.10", "3.11", "3.12"]
-LATEST = SUPPORTED[-1]
+SUPPORTED = ["3.8", "3.9", "3.10", "pypy3.10", "3.11", "3.12", "3.13"]
+LATEST_STABLE = "3.12"
 
 nox.options.sessions = []
 
 
-def session(default=True, python=LATEST, **kwargs):  # noqa: D103
+def session(default=True, python=LATEST_STABLE, **kwargs):  # noqa: D103
     def _session(fn):
         if default:
             nox.options.sessions.append(kwargs.get("name", fn.__name__))
diff --git a/pyproject.toml b/pyproject.toml
index c4f7695c..1eea228f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -31,6 +31,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
   "Programming Language :: Python :: Implementation :: CPython",
   "Programming Language :: Python :: Implementation :: PyPy",
   "Topic :: File Formats :: JSON",