diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d3e00a9..fe23878 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -26,6 +26,7 @@ jobs:
           - "3.9"
           - "3.10"
           - "3.11"
+          - "3.12"
           - "pypy-3.7"
         vcs:
           - bzr
@@ -41,10 +42,10 @@ jobs:
         # ubuntu-18.04 and ubuntu20.04.
 
       - name: Git clone
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: "${{ matrix.python-version }}"
 
@@ -61,7 +62,7 @@ jobs:
         run: |
           python -m pip install -U pip
           python -m pip install -U setuptools wheel
-          python -m pip install -U coverage coveralls pytest flake8
+          python -m pip install -U coverage pytest flake8
           python -m pip install -e .[test]
 
       - name: Run tests
@@ -71,17 +72,17 @@ jobs:
           FORCE_TEST_VCS: ${{ matrix.vcs }}
 
       - name: Check test coverage
-        run: coverage report -m --fail-under=${{ matrix.vcs == 'bzr' && 99 || 100 }}
+        run: |
+          coverage report -m --fail-under=${{ matrix.vcs == 'bzr' && 99 || 100 }}
+          coverage xml
 
       - name: Run check-manifest on itself
         run: python check_manifest.py
 
       - name: Report to coveralls
-        run: coveralls
-        continue-on-error: true
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          COVERALLS_SERVICE_NAME: github
+        uses: coverallsapp/github-action@v2
+        with:
+          file: coverage.xml
 
   lint:
     name: ${{ matrix.toxenv }}
@@ -98,10 +99,10 @@ jobs:
 
     steps:
       - name: Git clone
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Set up Python ${{ env.default_python || '3.9' }}
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v4
         with:
           python-version: "${{ env.default_python || '3.9' }}"
 
diff --git a/CHANGES.rst b/CHANGES.rst
index 92fd57f..c794e36 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,7 +5,7 @@ Changelog
 0.50 (unreleased)
 -----------------
 
-- Nothing changed yet.
+- Add Python 3.12 support.
 
 
 0.49 (2022-12-05)
diff --git a/appveyor.yml b/appveyor.yml
index 73a0f48..3ac23e8 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -9,6 +9,7 @@ environment:
     - PYTHON: "C:\\Python39"
     - PYTHON: "C:\\Python310"
     - PYTHON: "C:\\Python311"
+    - PYTHON: "C:\\Python312"
 
 init:
   - "echo %PYTHON%"
@@ -23,7 +24,7 @@ install:
   - "set PATH=%PYTHON%;%PYTHON%\\Scripts;%PATH%"
   - python --version
   - pip install -U virtualenv  # upgrade pip in tox's virtualenvs
-  - pip install tox
+  - pip install tox setuptools
   - choco install bzr
   - "set PATH=C:\\Program Files (x86)\\Bazaar;%PATH%"
   - bzr --version
diff --git a/setup.py b/setup.py
index 3f05593..9dd35b4 100755
--- a/setup.py
+++ b/setup.py
@@ -49,6 +49,7 @@
         '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',
     ],
diff --git a/tox.ini b/tox.ini
index def27bf..a94ace2 100644
--- a/tox.ini
+++ b/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py37,py38,py39,py310,py311,pypy3,flake8
+    py37,py38,py39,py310,py311,py312,pypy3,flake8
 
 [testenv]
 passenv =