diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6dcc37c..abc22dc 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -23,7 +23,7 @@ jobs:
       fail-fast: true
       matrix:
         os: ["ubuntu-latest", "macos-latest", "windows-latest"]
-        python-version: ["3.8", "3.11"]
+        python-version: ["3.8", "3.12"]
 
     env:
       OS: ${{ matrix.os }}
@@ -55,8 +55,14 @@ jobs:
         # https://github.com/pypa/setuptools/blob/main/CHANGES.rst#v6400
         pip install "setuptools>=64" --upgrade
 
+        # Install `wheel` package.
+        pip install wheel
+
         # Install package in editable mode.
-        pip install --use-pep517 --prefer-binary --editable=.[develop,docs,test]
+        # FIXME: Workaround for installing pendulum 2.x on Python 3.12.
+        # https://github.com/sdispater/pendulum/issues/454#issuecomment-654096754
+        pip install poetry
+        pip install --use-pep517 --prefer-binary --no-build-isolation --editable=.[develop,test]
 
     - name: Run linter and software tests
       run: |
diff --git a/CHANGES.md b/CHANGES.md
index 4a3dc2b..2218420 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,7 +2,7 @@
 
 
 ## in progress
-
+- Maintenance: Add support for macOS, Windows, and Python 3.12
 
 ## 2023-08-23 v0.1.0
 - Initial thing, using `arbitrary-dateparser` and `DateRangeParser` packages
diff --git a/pyproject.toml b/pyproject.toml
index 00ac69c..aac648a 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,7 @@ classifiers = [
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
   "Topic :: Communications",
   "Topic :: Education",
   "Topic :: Home Automation",
@@ -71,7 +72,6 @@ dynamic = [
 [project.optional-dependencies]
 develop = [
   "black<25",
-  "build<2",
   "mypy==1.8.0",
   "poethepoet<1",
   "pyproject-fmt<1.8",