diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 5a12223..cb8fc40 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -128,7 +128,7 @@ jobs:
           echo "dir=$(pip cache dir)" >>$GITHUB_OUTPUT
 
       - name: pip cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-${{ matrix.python-version }}
@@ -291,7 +291,7 @@ jobs:
           echo "dir=$(pip cache dir)" >>$GITHUB_OUTPUT
 
       - name: pip cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-${{ matrix.python-version }}
@@ -386,7 +386,7 @@ jobs:
           echo "dir=$(pip cache dir)" >>$GITHUB_OUTPUT
 
       - name: pip cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-${{ matrix.python-version }}
@@ -437,7 +437,7 @@ jobs:
           echo "dir=$(pip cache dir)" >>$GITHUB_OUTPUT
 
       - name: pip cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip-${{ matrix.python-version }}
@@ -490,7 +490,7 @@ jobs:
           echo "dir=$(pip cache dir)" >>$GITHUB_OUTPUT
 
       - name: pip cache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
           path: ${{ steps.pip-cache.outputs.dir }}
           key: ${{ runner.os }}-pip_manylinux-${{ matrix.image }}-${{ matrix.python-version }}
diff --git a/.meta.toml b/.meta.toml
index 500ad3d..87a8416 100644
--- a/.meta.toml
+++ b/.meta.toml
@@ -10,7 +10,7 @@ with-windows = false
 with-pypy = true
 with-docs = true
 with-sphinx-doctests = true
-with-future-python = true
+with-future-python = false
 with-macos = false
 
 [tox]
diff --git a/CHANGES.rst b/CHANGES.rst
index e4cbe65..7336af3 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@
 6.1 (unreleased)
 ================
 
-- Add preliminary support for Python 3.12b4.
+- Add support for Python 3.12.
 
 - Add preliminary support for Python 3.13 as of 3.13a3.
 
diff --git a/setup.py b/setup.py
index 5a1e939..48b474c 100644
--- a/setup.py
+++ b/setup.py
@@ -92,6 +92,7 @@ def _unavailable(self, e):
           'Programming Language :: Python :: 3.9',
           'Programming Language :: Python :: 3.10',
           'Programming Language :: Python :: 3.11',
+          'Programming Language :: Python :: 3.12',
           'Programming Language :: Python :: Implementation :: CPython',
           'Programming Language :: Python :: Implementation :: PyPy',
           'Natural Language :: English',
diff --git a/src/zope/index/text/okapiindex.py b/src/zope/index/text/okapiindex.py
index a79e51f..229cb55 100644
--- a/src/zope/index/text/okapiindex.py
+++ b/src/zope/index/text/okapiindex.py
@@ -200,7 +200,7 @@
 
 _py_impl = getattr(platform, 'python_implementation', lambda: None)
 _is_pypy = _py_impl() == 'PyPy'
-PURE_PYTHON = os.environ.get('PURE_PYTHON') or _is_pypy
+PURE_PYTHON = int(os.environ.get('PURE_PYTHON', '0')) or _is_pypy
 try:
     from zope.index.text.okascore import score
 except ImportError:  # pragma: no cover