diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index eca64311..7aead457 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -75,7 +75,6 @@ jobs:
       uses: actions/setup-python@v5
       with:
         python-version: ${{ matrix.python }}
-        allow-prereleases: true
 
     - name: Setup Boost (Linux)
       # Can't use boost + define _
diff --git a/.github/workflows/upstream.yml b/.github/workflows/upstream.yml
index 356f472b..1a5c3e4b 100644
--- a/.github/workflows/upstream.yml
+++ b/.github/workflows/upstream.yml
@@ -13,13 +13,12 @@ concurrency:
 
 env:
   PIP_BREAK_SYSTEM_PACKAGES: 1
-  PIP_ONLY_BINARY: ":all:"
   # For cmake:
   VERBOSE: 1
 
 jobs:
   standard:
-    name: "🐍 3.12 latest • ubuntu-latest • x64"
+    name: "🐍 3.13 latest • ubuntu-latest • x64"
     runs-on: ubuntu-latest
     # Only runs when the  'python dev' label is selected
     if: "contains(github.event.pull_request.labels.*.name, 'python dev')"
@@ -27,10 +26,11 @@ jobs:
     steps:
     - uses: actions/checkout@v4
 
-    - name: Setup Python 3.12
+    - name: Setup Python 3.13
       uses: actions/setup-python@v5
       with:
-        python-version: "3.12-dev"
+        python-version: "3.13"
+        allow-prereleases: true
 
     - name: Setup Boost
       run: sudo apt-get install libboost-dev
diff --git a/include/pybind11/detail/class.h b/include/pybind11/detail/class.h
index 60fed8dc..0b9ea42d 100644
--- a/include/pybind11/detail/class.h
+++ b/include/pybind11/detail/class.h
@@ -519,8 +519,12 @@ inline PyObject *make_object_base_type(PyTypeObject *metaclass) {
 
 /// dynamic_attr: Allow the garbage collector to traverse the internal instance `__dict__`.
 extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *arg) {
+#if PY_VERSION_HEX >= 0x030D0000
+    PyObject_VisitManagedDict(self, visit, arg);
+#else
     PyObject *&dict = *_PyObject_GetDictPtr(self);
     Py_VISIT(dict);
+#endif
 // https://docs.python.org/3/c-api/typeobj.html#c.PyTypeObject.tp_traverse
 #if PY_VERSION_HEX >= 0x03090000
     Py_VISIT(Py_TYPE(self));
@@ -530,8 +534,12 @@ extern "C" inline int pybind11_traverse(PyObject *self, visitproc visit, void *a
 
 /// dynamic_attr: Allow the GC to clear the dictionary.
 extern "C" inline int pybind11_clear(PyObject *self) {
+#if PY_VERSION_HEX >= 0x030D0000
+    PyObject_ClearManagedDict(self);
+#else
     PyObject *&dict = *_PyObject_GetDictPtr(self);
     Py_CLEAR(dict);
+#endif
     return 0;
 }
 
diff --git a/tests/requirements.txt b/tests/requirements.txt
index 83a3690a..e056c6fa 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -7,9 +7,9 @@ numpy~=1.25.0; python_version=="3.9" and platform_python_implementation=='PyPy'
 numpy~=1.19.3; platform_python_implementation!="PyPy" and python_version=="3.6"
 numpy~=1.21.5; platform_python_implementation!="PyPy" and python_version>="3.7" and python_version<"3.10"
 numpy~=1.22.2; platform_python_implementation!="PyPy" and python_version=="3.10"
-numpy~=1.26.0; platform_python_implementation!="PyPy" and python_version>="3.11"
+numpy~=1.26.0; platform_python_implementation!="PyPy" and python_version>="3.11" and python_version<"3.13"
 pytest~=7.0
 pytest-timeout
 scipy~=1.5.4; platform_python_implementation!="PyPy" and python_version<"3.10"
 scipy~=1.8.0; platform_python_implementation!="PyPy" and python_version=="3.10"
-scipy~=1.11.1; platform_python_implementation!="PyPy" and python_version>="3.11"
+scipy~=1.11.1; platform_python_implementation!="PyPy" and python_version>="3.11" and python_version<"3.13"