diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8c2e8339..3941d138 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,7 +31,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - uses: hynek/build-and-inspect-python-package@f336040a31ea03a2551adcc994d3ddb2f3ea3f7f
+    - uses: hynek/build-and-inspect-python-package@6a687a6d3567bc184c1fc694ee7f0f328594ef25
 
     - name: Set up ${{ matrix.python.name }}
       uses: actions/setup-python@v4
@@ -59,6 +59,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # Keep list in-sync with noxfile/tests & pyproject.toml.
         python:
           - name: CPython 3.8
             action: 3.8
@@ -68,6 +69,8 @@ jobs:
             action: '3.10'
           - name: CPython 3.11
             action: '3.11'
+          - name: CPython 3.12
+            action: '3.12'
           - name: PyPy 3.8
             action: pypy3.8
         task:
@@ -87,6 +90,8 @@ jobs:
       uses: actions/setup-python@v4
       with:
         python-version: ${{ matrix.python.action }}
+        allow-prereleases: true
+        cache: pip
 
     - name: Install dependencies
       run: python -m pip install --upgrade pip nox
@@ -252,7 +257,7 @@ jobs:
         python -Im coverage html --skip-covered --skip-empty
 
         # Report and write to summary.
-        python -Im coverage report | sed 's/^/    /' >> $GITHUB_STEP_SUMMARY
+        python -Im coverage report --format=markdown >> $GITHUB_STEP_SUMMARY
 
         # Report again and fail if under 100%.
         python -Im coverage report --fail-under=100
diff --git a/noxfile.py b/noxfile.py
index 3f792708..bcd7f4ef 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -17,7 +17,8 @@ def pre_commit(session: nox.Session) -> None:
     session.run("pre-commit", "run", "--all-files", "--show-diff-on-failure")
 
 
-@nox.session(python=["pypy3.8", "3.8", "3.9", "3.10", "3.11"])
+# Keep list in-sync with ci.yml/test-linux & pyproject.toml
+@nox.session(python=["pypy3.8", "3.8", "3.9", "3.10", "3.11", "3.12"])
 def tests(session: nox.Session) -> None:
     session.install("Twisted", "coverage[toml]")
     posargs = list(session.posargs)
diff --git a/pyproject.toml b/pyproject.toml
index 11481040..9f79487a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,6 +12,7 @@ name = "towncrier"
 description = "Building newsfiles for your project."
 readme = "README.rst"
 license = "MIT"
+# Keep version list in-sync with noxfile/tests & ci.yml/test-linux.
 classifiers = [
     "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
@@ -22,6 +23,7 @@ classifiers = [
     "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/src/towncrier/newsfragments/541.feature b/src/towncrier/newsfragments/541.feature
new file mode 100644
index 00000000..22256fa1
--- /dev/null
+++ b/src/towncrier/newsfragments/541.feature
@@ -0,0 +1 @@
+Python 3.12 is now officially supported.