diff --git a/.editorconfig b/.editorconfig
index 9d3c4f2..5094013 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -2,7 +2,7 @@
 # https://github.com/zopefoundation/meta/tree/master/config/c-code
 #
 # EditorConfig Configuration file, for more details see:
-# http://EditorConfig.org
+# https://EditorConfig.org
 # EditorConfig is a convention description, that could be interpreted
 # by multiple editors to enforce common coding conventions for specific
 # file types
diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
index eaf3a78..8f2ad3c 100644
--- a/.github/workflows/pre-commit.yml
+++ b/.github/workflows/pre-commit.yml
@@ -24,7 +24,7 @@ jobs:
     - uses: actions/checkout@v5
     - uses: actions/setup-python@v6
       with:
-        python-version: 3.x
+        python-version: '3.13'
     - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd  #v3.0.1
       with:
         extra_args: --all-files --show-diff-on-failure
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4db7453..6687f58 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -93,12 +93,12 @@ jobs:
       matrix:
         python-version:
           - "pypy-3.11"
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
           - "3.14"
+          - "3.15"
         os: [ubuntu-latest, macos-latest, windows-latest]
         exclude:
           - os: macos-latest
@@ -150,13 +150,13 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-pip-
 
-      - name: Install Build Dependencies (3.14)
-        if: matrix.python-version == '3.14'
+      - name: Install Build Dependencies (3.15)
+        if: matrix.python-version == '3.15'
         run: |
           pip install -U pip
           pip install -U "setuptools >= 78.1.1,< 81" wheel twine
       - name: Install Build Dependencies
-        if: matrix.python-version != '3.14'
+        if: matrix.python-version != '3.15'
         run: |
           pip install -U pip
           pip install -U "setuptools >= 78.1.1,< 81" wheel twine
@@ -197,15 +197,15 @@ jobs:
           python setup.py build_ext -i
           python setup.py bdist_wheel
 
-      - name: Install persistent and dependencies (3.14)
-        if: matrix.python-version == '3.14'
+      - name: Install persistent and dependencies (3.15)
+        if: matrix.python-version == '3.15'
         run: |
           # Install to collect dependencies into the (pip) cache.
           # Use "--pre" here because dependencies with support for this future
           # Python release may only be available as pre-releases
           pip install --pre .[test]
       - name: Install persistent and dependencies
-        if: matrix.python-version != '3.14'
+        if: matrix.python-version != '3.15'
         run: |
           # Install to collect dependencies into the (pip) cache.
           pip install -U pip "setuptools >= 78.1.1,< 81"
@@ -240,20 +240,6 @@ jobs:
         with:
           name: persistent-${{ runner.os }}-${{ matrix.python-version }}.whl
           path: dist/*whl
-      - name: Publish package to PyPI (Non-Linux)
-        # We cannot use pypa/gh-action-pypi-publish because that
-        # is a container action, and those don't run on macOS
-        # or Windows GHA runners.
-        if: >
-          github.event_name == 'push'
-          && startsWith(github.ref, 'refs/tags')
-          && !startsWith(runner.os, 'Linux')
-          && !startsWith(matrix.python-version, 'pypy')
-          && !startsWith(matrix.python-version, '3.14')
-        env:
-          TWINE_PASSWORD: ${{ secrets.TWINE_PASSWORD }}
-        run: |
-          twine upload --skip-existing dist/*
 
   test:
     needs: build-package
@@ -263,12 +249,12 @@ jobs:
       matrix:
         python-version:
           - "pypy-3.11"
-          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
           - "3.14"
+          - "3.15"
         os: [ubuntu-latest, macos-latest, windows-latest]
         exclude:
           - os: macos-latest
@@ -326,7 +312,7 @@ jobs:
           name: persistent-${{ runner.os }}-${{ matrix.python-version }}.whl
           path: dist/
       - name: Install persistent ${{ matrix.python-version }}
-        if: matrix.python-version == '3.14'
+        if: matrix.python-version == '3.15'
         run: |
           pip install -U wheel "setuptools >= 78.1.1,< 81"
           # coverage might have a wheel on PyPI for a future python version which is
@@ -341,7 +327,7 @@ jobs:
           # Python release may only be available as pre-releases
           pip install --pre -e .[test]
       - name: Install persistent
-        if: matrix.python-version != '3.14'
+        if: matrix.python-version != '3.15'
         run: |
           pip install -U wheel "setuptools >= 78.1.1,< 81"
           pip install -U coverage[toml]
@@ -387,7 +373,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.13"]
         os: [ubuntu-latest]
 
     steps:
@@ -458,7 +444,7 @@ jobs:
     runs-on: "ubuntu-latest"
     strategy:
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.13"]
         os: [ubuntu-latest]
 
     steps:
@@ -524,14 +510,21 @@ jobs:
           tox -e release-check
 
   manylinux:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
-    # We use a regular Python matrix entry to share as much code as possible.
+    # We use a matrix to share as much code as possible.
     strategy:
       matrix:
-        python-version: ["3.11"]
-        image: [manylinux2014_x86_64, manylinux2014_i686, manylinux2014_aarch64]
-
+        include:
+          - os: ubuntu-latest
+            image: manylinux2014_x86_64
+            python-version: "3.13"
+          - os: ubuntu-latest
+            image: manylinux2014_i686
+            python-version: "3.13"
+          - os: ubuntu-24.04-arm
+            image: manylinux2014_aarch64
+            python-version: "3.13"
     steps:
       - name: checkout
         uses: actions/checkout@v5
@@ -580,8 +573,9 @@ jobs:
 
       - name: Update pip
         run: pip install -U pip
-      - name: Build persistent (x86_64)
-        if: matrix.image == 'manylinux2014_x86_64'
+
+      - name: Build persistent
+        if: matrix.image != 'manylinux2014_i686'
         # An alternate way to do this is to run the container directly with a uses:
         # and then the script runs inside it. That may work better with caching.
         # See https://github.com/pyca/bcrypt/blob/f6b5ee2eda76d077c531362ac65e16f045cf1f29/.github/workflows/wheel-builder.yml
@@ -596,31 +590,59 @@ jobs:
           PRE_CMD: linux32
         run: |
           bash .manylinux.sh
-      - name: Build persistent (aarch64)
-        if: matrix.image == 'manylinux2014_aarch64'
-        env:
-          DOCKER_IMAGE: quay.io/pypa/${{ matrix.image }}
-        run: |
-          # First we must enable emulation
-          docker run --rm --privileged hypriot/qemu-register
-          bash .manylinux.sh
 
       - name: Upload persistent wheels
         uses: actions/upload-artifact@v4
         with:
           path: wheelhouse/*whl
           name: manylinux_${{ matrix.image }}_wheels.zip
+
       - name: Restore pip cache permissions
         run: sudo chown -R $(whoami) ${{ steps.pip-cache-default.outputs.dir }}
+
       - name: Prevent publishing wheels for unreleased Python versions
-        run: VER=$(echo '3.14' | tr -d .) && ls -al wheelhouse && sudo rm -f wheelhouse/*-cp${VER}*.whl && ls -al wheelhouse
-      - name: Publish package to PyPI
+        run: VER=$(echo '3.15' | tr -d .) && ls -al wheelhouse && sudo rm -f wheelhouse/*-cp${VER}*.whl && ls -al wheelhouse
+
+  publish:
+    name: Publish to PyPI
+    runs-on: ubuntu-latest
+    # Only publish on tag pushes
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
+    # Wait for both build jobs to complete
+    needs: [build-package, manylinux]
+    permissions:
+      contents: read
+
+    steps:
+      - name: Download all wheel artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: dist/
+          pattern: '*'
+          merge-multiple: true
+
+      - name: Display structure of downloaded files
+        run: |
+          ls -lR dist/
+          echo "Total wheel files:"
+          find dist/ -name "*.whl" | wc -l
+
+      - name: Remove undesired wheels (if any were downloaded)
+        run: |
+          # PyPy wheels shouldn't be uploaded, remove them if present
+          find dist/ -name "*pypy*" -type f -delete || true
+          find dist/ -name "*none-any*" -type f -delete || true
+          # Wheels for the no-yet-supported future Python version need to go
+          find dist/ -name "*3.15*" -type f -delete || true
+          find dist/ -name "*cp315*" -type f -delete || true
+          # For Linux, we only want the manylinux wheels
+          find dist/ -name "*linux_x86_64*" -type f -delete || true
+
+      - name: Publish to PyPI
         uses: pypa/gh-action-pypi-publish@release/v1
-        if: >
-          github.event_name == 'push'
-          && startsWith(github.ref, 'refs/tags')
         with:
           user: __token__
           password: ${{ secrets.TWINE_PASSWORD }}
           skip-existing: true
-          packages-dir: wheelhouse/
+          packages-dir: dist/
+          verbose: true
diff --git a/.manylinux-install.sh b/.manylinux-install.sh
index 2840acb..acf8744 100755
--- a/.manylinux-install.sh
+++ b/.manylinux-install.sh
@@ -28,12 +28,12 @@ yum -y install libffi-devel
 
 tox_env_map() {
     case $1 in
-        *"cp39"*) echo 'py39';;
         *"cp310"*) echo 'py310';;
         *"cp311"*) echo 'py311';;
         *"cp312"*) echo 'py312';;
         *"cp313"*) echo 'py313';;
         *"cp314"*) echo 'py314';;
+        *"cp315"*) echo 'py315';;
         *) echo 'py';;
     esac
 }
@@ -41,13 +41,13 @@ tox_env_map() {
 # Compile wheels
 for PYBIN in /opt/python/*/bin; do
     if \
-       [[ "${PYBIN}" == *"cp39/"* ]] || \
        [[ "${PYBIN}" == *"cp310/"* ]] || \
        [[ "${PYBIN}" == *"cp311/"* ]] || \
        [[ "${PYBIN}" == *"cp312/"* ]] || \
        [[ "${PYBIN}" == *"cp313/"* ]] || \
-       [[ "${PYBIN}" == *"cp314/"* ]] ; then
-        if [[ "${PYBIN}" == *"cp314/"* ]] ; then
+       [[ "${PYBIN}" == *"cp314/"* ]] || \
+       [[ "${PYBIN}" == *"cp315/"* ]] ; then
+        if [[ "${PYBIN}" == *"cp315/"* ]] ; then
             "${PYBIN}/pip" install --pre -e /io/
             "${PYBIN}/pip" wheel /io/ --pre -w wheelhouse/
         else
@@ -65,6 +65,9 @@ for PYBIN in /opt/python/*/bin; do
     fi
 done
 
+# Show what wheels we have
+echo "Fixing up the following wheels:"
+ls -l wheelhouse/persistent*.whl
 # Bundle external shared libraries into the wheels
 for whl in wheelhouse/persistent*.whl; do
     auditwheel repair "$whl" -w /io/wheelhouse/
diff --git a/.meta.toml b/.meta.toml
index ee932fa..17bb28d 100644
--- a/.meta.toml
+++ b/.meta.toml
@@ -2,7 +2,7 @@
 # https://github.com/zopefoundation/meta/tree/master/config/c-code
 [meta]
 template = "c-code"
-commit-id = "bfe21cd9"
+commit-id = "9fcd3d67"
 
 [python]
 with-windows = true
@@ -13,21 +13,17 @@ with-sphinx-doctests = true
 with-macos = false
 
 [tox]
-use-flake8 = true
 coverage-command = [
     "coverage run -m zope.testrunner --test-path=src {posargs:-vc}",
     "python -c 'import os, subprocess; subprocess.check_call(\"coverage run -a -m zope.testrunner --test-path=src\", env=dict(os.environ, PURE_PYTHON=\"0\"), shell=True)'",
-    ]
+]
 
 [coverage]
 fail-under = 94.9
 
 [coverage-run]
 source = "persistent"
-additional-config = [
-    "omit =",
-    "     _ring_build.py",
-    ]
+additional-config = ["omit =", "     _ring_build.py"]
 
 [manifest]
 additional-rules = [
@@ -35,9 +31,10 @@ additional-rules = [
     "include *.sh",
     "recursive-include docs *.bat",
     "recursive-include src *.h",
-    ]
+]
 
 [check-manifest]
 additional-ignores = [
     "docs/_build/html/_sources/api/*",
-    ]
+    "docs/_build/html/_static/scripts/*",
+]
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index d3dfcd3..2a52c5c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -3,7 +3,7 @@
 minimum_pre_commit_version: '3.6'
 repos:
   - repo: https://github.com/pycqa/isort
-    rev: "6.0.1"
+    rev: "7.0.0"
     hooks:
     - id: isort
   - repo: https://github.com/hhatto/autopep8
@@ -12,10 +12,10 @@ repos:
     - id: autopep8
       args: [--in-place, --aggressive, --aggressive]
   - repo: https://github.com/asottile/pyupgrade
-    rev: v3.20.0
+    rev: v3.21.0
     hooks:
     - id: pyupgrade
-      args: [--py39-plus]
+      args: [--py310-plus]
   - repo: https://github.com/isidentical/teyit
     rev: 0.4.3
     hooks:
diff --git a/CHANGES.rst b/CHANGES.rst
index 613eccb..aa398f6 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -1,13 +1,16 @@
-==========================
- ``persistent`` Changelog
-==========================
+Change log
+==========
 
 6.4 (unreleased)
-================
+----------------
+
+- Add support for Python 3.14.
+
+- Drop support for Python 3.9.
 
 
 6.3 (2025-10-07)
-================
+----------------
 
 - Fix setuptools configuration to build missing cffi extension module.
   The released wheels for version 6.2 will not work, they are missing
@@ -16,7 +19,7 @@
 
 
 6.2 (2025-10-02)
-================
+----------------
 
 - Add preliminary support for Python 3.14b2.
 
@@ -30,14 +33,14 @@
 
 
 6.1.1 (2025-02-26)
-==================
+------------------
 
 - Use ``Py_REFCNT`` to access ``cPersistentObject`` reference counts in
   assertions.
 
 
 6.1 (2024-09-17)
-================
+----------------
 
 - Add final support for Python 3.13.
 
@@ -46,7 +49,7 @@
 
 
 6.0 (2024-05-30)
-================
+----------------
 
 - Drop support for Python 3.7.
 
@@ -54,19 +57,19 @@
 
 
 5.2 (2024-02-16)
-================
+----------------
 
 - Add preliminary support for Python 3.13a3.
 
 
 5.1 (2023-10-05)
-================
+----------------
 
 - Add support for Python 3.12.
 
 
 5.0 (2023-01-09)
-================
+----------------
 
 - Build Linux binary wheels for Python 3.11.
 
@@ -74,19 +77,19 @@
 
 
 4.9.3 (2022-11-16)
-==================
+------------------
 
 - Add support for building arm64 wheels on macOS.
 
 
 4.9.2 (2022-11-03)
-==================
+------------------
 
 - Update Python 3.11 support to final release.
 
 
 4.9.1 (2022-09-16)
-==================
+------------------
 
 - Update Python 3.11 support to 3.11.0-rc1.
 
@@ -95,33 +98,39 @@
 
 
 4.9.0 (2022-03-10)
-==================
+------------------
 
 - Add support for Python 3.11 (as of 3.11a5).
 
 
 4.8.0 (2022-03-07)
-==================
+------------------
 
 - Switch package to src-layout, this is a packaging only change.
   (`#168 <https://github.com/zopefoundation/persistent/pull/168>`_)
+
 - Add support for Python 3.10.
 
 
 4.7.0 (2021-04-13)
-==================
+------------------
 
 - Add support for Python 3.9.
+
 - Move from Travis CI to Github Actions.
+
 - Supply manylinux wheels for aarch64 (ARM).
+
 - Fix the pure-Python implementation to activate a ghost object
   when setting its ``__class__`` and ``__dict__``. This matches the
   behaviour of the C implementation. See `issue 155
   <https://github.com/zopefoundation/persistent/issues/155>`_.
+
 - Fix the CFFI cache implementation (used on CPython when
   ``PURE_PYTHON=1``) to not print unraisable ``AttributeErrors`` from
   ``_WeakValueDictionary`` during garbage collection. See `issue 150
   <https://github.com/zopefoundation/persistent/issues/150>`_.
+
 - Make the pure-Python implementation of the cache run a garbage
   collection (``gc.collect()``) on ``full_sweep``, ``incrgc`` and
   ``minimize`` *if* it detects that an object that was weakly
@@ -130,16 +139,20 @@
   ``zope.interface`` utilities/adapters registered. This partly
   reverts a change from release 4.2.3.
 
+
 4.6.4 (2020-03-26)
-==================
+------------------
 
 - Fix an overly specific test failure using zope.interface 5. See
   `issue 144 <https://github.com/zopefoundation/persistent/issues/144>`_.
+
 - Fix two reference leaks that could theoretically occur as the result
-  of obscure errors. See `issue 143 <https://github.com/zopefoundation/persistent/issues/143>`_.
+  of obscure errors.
+  See `issue 143 <https://github.com/zopefoundation/persistent/issues/143>`_.
+
 
 4.6.3 (2020-03-18)
-==================
+------------------
 
 - Fix a crash in the test suite under a 32-bit CPython on certain
   32-bit platforms. See `issue 137
@@ -148,7 +161,7 @@
 
 
 4.6.2 (2020-03-12)
-==================
+------------------
 
 - Fix an ``AssertionError`` clearing a non-empty ``PersistentMapping``
   that has no connection. See `issue 139
@@ -156,7 +169,7 @@
 
 
 4.6.1 (2020-03-06)
-==================
+------------------
 
 - Stop installing C header files on PyPy (which is what persistent before 4.6.0
   used to do), fixes `issue 135
@@ -164,7 +177,7 @@
 
 
 4.6.0 (2020-03-05)
-==================
+------------------
 
 - Fix slicing of ``PersistentList`` to always return instances of the
   same class. It was broken on Python 3 prior to 3.7.4.
@@ -178,7 +191,8 @@
   non-empty value prevents the extensions from being used. Also, all C
   extensions are required together or none of them will be used. This
   prevents strange errors that arise from a mismatch of Python and C
-  implementations. See `issue 131 <https://github.com/zopefoundation/persistent/issues/131>`_.
+  implementations.
+  See `issue 131 <https://github.com/zopefoundation/persistent/issues/131>`_.
 
   Note that some private implementation details such as the names of
   the pure-Python implementations have changed.
@@ -209,8 +223,9 @@
   Note that ``ctypes`` is required to use the Python implementation
   (except on PyPy).
 
+
 4.5.1 (2019-11-06)
-==================
+------------------
 
 - Add support for Python 3.8.
 
@@ -218,7 +233,7 @@
 
 
 4.5.0 (2019-05-09)
-==================
+------------------
 
 - Fully test the C implementation of the PickleCache, and fix
   discrepancies between it and the Python implementation:
@@ -250,7 +265,7 @@
 
 
 4.4.3 (2018-10-22)
-==================
+------------------
 
 - Fix the repr of the persistent objects to include the module name
   when using the C extension. This matches the pure-Python behaviour
@@ -264,7 +279,7 @@
 
 
 4.4.2 (2018-08-28)
-==================
+------------------
 
 - Explicitly use unsigned constants for packing and unpacking C
   timestamps, fixing an arithmetic issue for GCC when optimizations
@@ -273,14 +288,14 @@
 
 
 4.4.1 (2018-08-23)
-==================
+------------------
 
 - Fix installation of source packages on PyPy. See `issue 88
   <https://github.com/zopefoundation/persistent/issues/88>`_.
 
 
 4.4.0 (2018-08-22)
-==================
+------------------
 
 - Use unsigned constants when doing arithmetic on C timestamps,
   possibly avoiding some overflow issues with some compilers or
@@ -331,10 +346,11 @@
 
 
 4.3.0 (2018-07-30)
-==================
+------------------
 
 - Fix the possibility of a rare crash in the C extension when
-  deallocating items. See https://github.com/zopefoundation/persistent/issues/66
+  deallocating items.
+  See https://github.com/zopefoundation/persistent/issues/66
 
 - Change cPickleCache's comparison of object sizes to determine
   whether an object can go in the cache to use ``PyObject_TypeCheck()``.
@@ -347,19 +363,19 @@
 
 
 4.2.4.2 (2017-04-23)
-====================
+--------------------
 
 - Packaging-only release: fix Python 2.7 ``manylinux`` wheels.
 
 
 4.2.4.1 (2017-04-21)
-====================
+--------------------
 
 - Packaging-only release:  get ``manylinux`` wheel built automatically.
 
 
 4.2.4 (2017-03-20)
-==================
+------------------
 
 - Avoid raising a ``SystemError: error return without exception set``
   when loading an object with slots whose jar generates an exception
@@ -367,7 +383,7 @@
 
 
 4.2.3 (2017-03-08)
-==================
+------------------
 
 - Fix the hashcode of Python ``TimeStamp`` objects on 64-bit Python on
   Windows. See https://github.com/zopefoundation/persistent/pull/55
@@ -389,7 +405,7 @@
 
 
 4.2.2 (2016-11-29)
-==================
+------------------
 
 - Drop use of ``ctypes`` for determining maximum integer size, to increase
   pure-Python compatibility. See https://github.com/zopefoundation/persistent/pull/31
@@ -402,14 +418,14 @@
 
 
 4.2.1 (2016-05-26)
-==================
+------------------
 
 - Fix the hashcode of C ``TimeStamp`` objects on 64-bit Python 3 on
   Windows.
 
 
 4.2.0 (2016-05-05)
-==================
+------------------
 
 - Fixed the Python(/PYPY) implementation ``TimeStamp.timeTime`` method
   to have subsecond precision.
@@ -423,13 +439,13 @@
 
 
 4.1.1 (2015-06-02)
-==================
+------------------
 
 - Fix manifest and re-upload to fix stray files included in 4.1.0.
 
 
 4.1.0 (2015-05-19)
-==================
+------------------
 
 - Make the Python implementation of ``Persistent`` and ``PickleCache``
   behave more similarly to the C implementation. In particular, the
@@ -439,7 +455,7 @@
 
 
 4.0.9 (2015-04-08)
-==================
+------------------
 
 - Make the C and Python ``TimeStamp`` objects behave more alike. The
   Python version now produces the same ``repr`` and ``.raw()`` output as
@@ -455,7 +471,7 @@
 
 
 4.0.8 (2014-03-20)
-==================
+------------------
 
 - Add support for Python 3.4.
 
@@ -474,7 +490,7 @@
 
 
 4.0.7 (2014-02-20)
-==================
+------------------
 
 - Avoid a KeyError from ``_p_accessed()`` on newly-created objects under
   pure-Python:  these objects may be assigned to a jar, but not yet added
@@ -491,20 +507,20 @@
 
 
 4.0.6 (2013-01-03)
-==================
+------------------
 
 - Updated Trove classifiers.
 
 
 4.0.5 (2012-12-14)
-==================
+------------------
 
 - Fixed the C-extensions under Py3k (previously they compiled but were
   not importable).
 
 
 4.0.4 (2012-12-11)
-==================
+------------------
 
 - Added support for Python 3.3.
 
@@ -513,7 +529,7 @@
 
 
 4.0.3 (2012-11-19)
-==================
+------------------
 
 - Fixed: In the C implimentation, an integer was compared with a
   pointer, with undefined results and a compiler warning.
@@ -527,13 +543,13 @@
 
 
 4.0.2 (2012-08-27)
-==================
+------------------
 
 - Correct initialization functions in renamed ``_timestamp`` extension.
 
 
 4.0.1 (2012-08-26)
-==================
+------------------
 
 - Worked around test failure due to overflow to long on 32-bit systems.
 
@@ -549,7 +565,7 @@
 
 
 4.0.0 (2012-08-11)
-==================
+------------------
 
 Platform Changes
 ----------------
diff --git a/docs/conf.py b/docs/conf.py
index 5aa9944..efd5048 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -30,7 +30,7 @@
 # -- Options for HTML output -------------------------------------------------
 # https://www.sphinx-doc.org/en/master/usage/configuration.html#options-for-html-output
 
-html_theme = 'sphinx_rtd_theme'
+html_theme = 'furo'
 # html_static_path = ['_static']
 
 # Example configuration for intersphinx: refer to the Python standard library.
diff --git a/docs/requirements.txt b/docs/requirements.txt
index 62b6df6..d25c685 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,3 @@
 Sphinx
 repoze.sphinx.autointerface
-sphinx_rtd_theme>1
-docutils<0.19
+furo
diff --git a/pyproject.toml b/pyproject.toml
index acaeb6a..a36c4a5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,9 +7,64 @@ requires = [
     "setuptools",
     "wheel",
     "cffi; platform_python_implementation == 'CPython'",
+    "pycparser",
 ]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "persistent"
+version = "6.4.dev0"
+description = "Translucent persistent objects"
+readme = "README.rst"
+requires-python = ">=3.10"
+license = "ZPL-2.1"
+authors = [
+  { name = "Zope Foundation and contributors", email = "zope-dev@zope.dev" },
+]
+maintainers = [
+  { name = "Plone Foundation and contributors", email = "zope-dev@zope.dev" },
+]
+classifiers = [
+  "Development Status :: 6 - Mature",
+  "Framework :: ZODB",
+  "Intended Audience :: Developers",
+  "Operating System :: OS Independent",
+  "Programming Language :: Python",
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3 :: Only",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Programming Language :: Python :: 3.13",
+  "Programming Language :: Python :: 3.14",
+  "Programming Language :: Python :: Implementation :: CPython",
+  "Programming Language :: Python :: Implementation :: PyPy",
+  "Topic :: Database",
+  "Topic :: Software Development :: Libraries :: Python Modules",
+]
+dependencies = [
+  "zope.deferredimport",
+  "zope.interface",
+  "cffi ; platform_python_implementation == 'CPython'",
+]
+
+[project.optional-dependencies]
+docs = [
+  "Sphinx",
+  "repoze.sphinx.autointerface",
+  "furo",
+]
+test = [
+  "manuel",
+  "zope.testrunner >= 6.4",
+]
+
+[project.urls]
+Documentation = "https://persistent.readthedocs.io"
+Issues = "https://github.com/zopefoundation/persistent/issues"
+Source = "https://github.com/zopefoundation/persistent"
+Changelog = "https://github.com/zopefoundation/persistent/blob/master/CHANGES.rst"
+
 [tool.coverage.run]
 branch = true
 source = ["persistent"]
diff --git a/setup.cfg b/setup.cfg
index d818cbe..0463858 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -14,6 +14,7 @@ ignore =
     docs/_build/html/_sources/*
     docs/_build/doctest/*
     docs/_build/html/_sources/api/*
+    docs/_build/html/_static/scripts/*
 
 [isort]
 force_single_line = True
diff --git a/setup.py b/setup.py
index 095ea2e..0994cef 100644
--- a/setup.py
+++ b/setup.py
@@ -12,27 +12,12 @@
 #
 ##############################################################################
 
-import os
 import platform
 
 from setuptools import Extension
-from setuptools import find_packages
 from setuptools import setup
 
 
-version = '6.4.dev0'
-
-here = os.path.abspath(os.path.dirname(__file__))
-
-
-def _read_file(filename):
-    with open(os.path.join(here, filename)) as f:
-        return f.read()
-
-
-README = (_read_file('README.rst') + '\n\n' + _read_file('CHANGES.rst'))
-
-
 define_macros = (
     # We currently use macros like PyBytes_AS_STRING
     # and internal functions like _PyObject_GetDictPtr
@@ -86,66 +71,6 @@ def _read_file(filename):
         'src/persistent/ring.h',
     ]
 
-setup(name='persistent',
-      version=version,
-      description='Translucent persistent objects',
-      long_description=README,
-      long_description_content_type='text/x-rst',
-      classifiers=[
-          "Development Status :: 6 - Mature",
-          "License :: OSI Approved :: Zope Public License",
-          "Programming Language :: Python",
-          "Programming Language :: Python :: 3",
-          "Programming Language :: Python :: 3.9",
-          "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",
-          "Framework :: ZODB",
-          "Topic :: Database",
-          "Topic :: Software Development :: Libraries :: Python Modules",
-          "Operating System :: Microsoft :: Windows",
-          "Operating System :: Unix",
-      ],
-      author="Zope Foundation and Contributors",
-      author_email="zodb-dev@zope.org",
-      url="https://github.com/zopefoundation/persistent/",
-      project_urls={
-          'Documentation': 'https://persistent.readthedocs.io',
-          'Issue Tracker': 'https://github.com/zopefoundation/'
-                           'persistent/issues',
-          'Sources': 'https://github.com/zopefoundation/persistent',
-      },
-      license="ZPL-2.1",
-      packages=find_packages('src'),
-      package_dir={'': 'src'},
-      include_package_data=True,
-      zip_safe=False,
-      ext_modules=ext_modules,
+setup(ext_modules=ext_modules,
       cffi_modules=['src/persistent/_ring_build.py:ffi'],
-      headers=headers,
-      setup_requires=[
-          "cffi ; platform_python_implementation == 'CPython'",
-          "pycparser",
-      ],
-      extras_require={
-          'test': [
-              'zope.testrunner',
-              'manuel',
-          ],
-          'testing': (),
-          'docs': [
-              'Sphinx',
-              'repoze.sphinx.autointerface',
-              'sphinx_rtd_theme',
-          ],
-      },
-      python_requires='>=3.9',
-      install_requires=[
-          'zope.deferredimport',
-          'zope.interface',
-          "cffi ; platform_python_implementation == 'CPython'",
-      ],
-      entry_points={})
+      headers=headers)
diff --git a/src/persistent/list.py b/src/persistent/list.py
index 40e44e1..4102ef0 100644
--- a/src/persistent/list.py
+++ b/src/persistent/list.py
@@ -13,7 +13,6 @@
 ##############################################################################
 
 """Python implementation of persistent list."""
-import sys
 from collections import UserList
 
 import persistent
@@ -52,30 +51,6 @@ class PersistentList(UserList, persistent.Persistent):
         else lambda inst: inst.__delitem__(_SLICE_ALL)
     )
 
-    if sys.version_info[:3] < (3, 7, 4):  # pragma: no cover
-        # Prior to 3.7.4, Python 3 failed to properly
-        # return an instance of the same class.
-        # See https://bugs.python.org/issue27639
-        # and https://github.com/zopefoundation/persistent/issues/112.
-        # We only define the special method on the necessary versions to avoid
-        # any speed penalty.
-        def __getitem__(self, item):
-            result = self.__super_getitem(item)
-            if isinstance(item, slice):
-                result = self.__class__(result)
-            return result
-
-    if sys.version_info[:3] < (3, 7, 4):  # pragma: no cover
-        # Likewise for __copy__.
-        # See
-        # https://github.com/python/cpython/commit/3645d29a1dc2102fdb0f5f0c0129ff2295bcd768
-        def __copy__(self):
-            inst = self.__class__.__new__(self.__class__)
-            inst.__dict__.update(self.__dict__)
-            # Create a copy and avoid triggering descriptors
-            inst.__dict__["data"] = self.__dict__["data"][:]
-            return inst
-
     def __setitem__(self, i, item):
         self.__super_setitem(i, item)
         self._p_changed = 1
diff --git a/src/persistent/mapping.py b/src/persistent/mapping.py
index 0c1b346..cb69438 100644
--- a/src/persistent/mapping.py
+++ b/src/persistent/mapping.py
@@ -93,8 +93,6 @@ def clear(self):
         # so if there was a _container it was persisted as data. We want
         # to preserve that, even if we won't make any modifications otherwise.
         needs_changed = '_container' in self.__dict__ or bool(self)
-        # Python 2 implements this by directly calling self.data.clear(),
-        # but Python 3 does so by repeatedly calling self.popitem()
         self.__super_clear()
         if needs_changed:
             self._p_changed = 1
diff --git a/src/persistent/tests/test_mapping.py b/src/persistent/tests/test_mapping.py
index 1962576..f34218d 100644
--- a/src/persistent/tests/test_mapping.py
+++ b/src/persistent/tests/test_mapping.py
@@ -251,7 +251,7 @@ def test_update_keywords(self):
         self.assertEqual(pm, {'b': 42})
 
         pm = self._makeOne()
-        # ``other`` shows up in a Python 3 signature.
+        # ``other`` shows up in a Python signature.
         pm.update(other=42)
         self.assertEqual(pm, {'other': 42})
         pm = self._makeOne()
diff --git a/src/persistent/tests/test_persistence.py b/src/persistent/tests/test_persistence.py
index fa8aa3d..c1023b6 100644
--- a/src/persistent/tests/test_persistence.py
+++ b/src/persistent/tests/test_persistence.py
@@ -1833,10 +1833,7 @@ class TestPersistent(self._getTargetClass()):
 
     def _normalize_repr(self, r):
         # addresses
-        r = re.sub(r'at 0x[0-9a-fA-F]*', 'at 0xdeadbeef', r)
-        # Python 3.7 removed the trailing , in exception reprs
-        r = r.replace("',)", "')")
-        return r
+        return re.sub(r'at 0x[0-9a-fA-F]*', 'at 0xdeadbeef', r)
 
     def _normalized_repr(self, o):
         return self._normalize_repr(repr(o))
diff --git a/src/persistent/timestamp.py b/src/persistent/timestamp.py
index faa9a97..ac850d4 100644
--- a/src/persistent/timestamp.py
+++ b/src/persistent/timestamp.py
@@ -37,7 +37,7 @@
     # Make sure to overflow and wraparound just
     # like the C code does.
     from ctypes import c_long
-except ImportError:  # pragma: no cover
+except ModuleNotFoundError:  # pragma: no cover
     # XXX: This is broken on 64-bit windows, where
     # sizeof(long) != sizeof(Py_ssize_t)
     # sizeof(long) == 4, sizeof(Py_ssize_t) == 8
diff --git a/tox.ini b/tox.ini
index 4ae77e7..82ace46 100644
--- a/tox.ini
+++ b/tox.ini
@@ -5,18 +5,18 @@ minversion = 4.0
 envlist =
     release-check
     lint
-    py39,py39-pure
     py310,py310-pure
     py311,py311-pure
     py312,py312-pure
     py313,py313-pure
     py314,py314-pure
+    py315,py315-pure
     pypy3
     docs
     coverage
 
 [testenv]
-pip_pre = py314: true
+pip_pre = py315: true
 deps =
     setuptools >= 78.1.1,< 81
     Sphinx
@@ -66,7 +66,7 @@ deps =
 commands_pre =
 commands =
     check-manifest
-    check-python-versions --only setup.py,tox.ini,.github/workflows/tests.yml
+    check-python-versions --only pyproject.toml,setup.py,tox.ini,.github/workflows/tests.yml
     python -m build --sdist --no-isolation
     twine check dist/*