diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index bec239f..f7cce0d 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v3
@@ -44,13 +44,13 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
-          cache: "pip"
-          cache-dependency-path: "setup.cfg"
 
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
           python-version: 3.8
+          cache: "pip"
+          cache-dependency-path: "setup.cfg"
 
       - name: Install dependencies
         run: |
@@ -72,7 +72,7 @@ jobs:
     needs: [build_and_test]
     if: startsWith(github.ref, 'refs/tags/')
     env:
-      CIBW_BUILD: "cp3{8,9,10,11}-{manylinux_x86_64,manylinux_aarch64,macosx_arm64,macosx_x86_64}"
+      CIBW_BUILD: "cp3{8,9,10,11,12}-{manylinux_x86_64,manylinux_aarch64,macosx_arm64,macosx_x86_64}"
       CIBW_ARCHS_MACOS: "x86_64 arm64"
       # use line below to enable aarch64 builds
       # CIBW_ARCHS_LINUX: "auto aarch64"
diff --git a/.github/workflows/rebase_checker.yaml b/.github/workflows/rebase_checker.yaml
index 62aeca7..65516d9 100644
--- a/.github/workflows/rebase_checker.yaml
+++ b/.github/workflows/rebase_checker.yaml
@@ -1,4 +1,3 @@
----
 name: Check that 'main' is not merged into the development branch
 
 on: pull_request
diff --git a/pyproject.toml b/pyproject.toml
index 0b0052e..7025159 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [build-system]
 requires = [
-    "setuptools<65",
+    "setuptools",
     "lsst-versions >= 1.3.0",
     "wheel",
     "pybind11 >= 2.5.0",
diff --git a/setup.py b/setup.py
index e96aa88..fa4edf7 100644
--- a/setup.py
+++ b/setup.py
@@ -11,11 +11,12 @@
 
 import glob
 
-# Importing this automatically enables parallelized builds
-import numpy.distutils.ccompiler  # noqa: F401
-from pybind11.setup_helpers import Pybind11Extension, build_ext
+from pybind11.setup_helpers import ParallelCompile, Pybind11Extension, build_ext
 from setuptools import setup
 
+# Optional multithreaded build.
+ParallelCompile("NPY_NUM_BUILD_JOBS").install()
+
 # Find the source code -- we can combine it into a single module
 pybind_src = sorted(glob.glob("python/lsst/sphgeom/*.cc"))
 cpp_src = sorted(glob.glob("src/*.cc"))