diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index e4d000bb..583de754 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -50,10 +50,16 @@ jobs:
           - "3.9"
           - "3.10"
           - "3.11"
-          # - "3.12"
+          - "3.12"
         os:
           - ubuntu-latest
-          - macos-latest
+          # There shouldn't be any behavior differences between
+          # OSes, so we'll only run the test suite on Ubuntu for now.
+          # Also, since I (the main maintainer) develop on a macOS
+          # machine, I'll run the tests locally on macOS before
+          # merging any PRs or releasing new versions. This should
+          # be sufficient and will speed up the CI process...
+          # - macos-latest
           # - windows-latest
       fail-fast: true
     runs-on: ${{ matrix.os }}
diff --git a/docs/reference/changelog.md b/docs/reference/changelog.md
index e3baf043..34a39d11 100644
--- a/docs/reference/changelog.md
+++ b/docs/reference/changelog.md
@@ -16,6 +16,10 @@ Unreleased changes
 - Use `importlib.resources` to load data assets from within the package - to be PEP-302 compliant ({gh-issue}`176`)
 - Enforce "strict" mypy mode (mostly improved type annotations for generic types) ({gh-issue}`177`)
 
+### CI/CD
+
+- Add support for Python 3.12 ({gh-issue}`182`)
+
 ---
 
 0.1.24
diff --git a/src/ridgeplot/_figure_factory.py b/src/ridgeplot/_figure_factory.py
index dbe94bbe..482f645d 100644
--- a/src/ridgeplot/_figure_factory.py
+++ b/src/ridgeplot/_figure_factory.py
@@ -127,6 +127,8 @@ def get_xy_extrema(densities: Densities) -> tuple[Numeric, Numeric, Numeric, Num
     ... )
     (-2, 4, 0, 4)
     """
+    if len(densities) == 0:
+        raise ValueError("The densities array should not be empty.")
     x_flat: list[Numeric] = []
     y_flat: list[Numeric] = []
     for row in densities:
diff --git a/tests/unit/test_figure_factory.py b/tests/unit/test_figure_factory.py
index 54841114..4072b3b6 100644
--- a/tests/unit/test_figure_factory.py
+++ b/tests/unit/test_figure_factory.py
@@ -24,7 +24,7 @@ class TestGetXYExtrema:
 
     def test_raise_for_empty_sequence(self) -> None:
         # Fails for empty sequence
-        with pytest.raises(ValueError, match="arg is an empty sequence"):
+        with pytest.raises(ValueError, match="The densities array should not be empty"):
             get_xy_extrema(densities=[])
 
     def test_raise_for_non_2d_array(self) -> None: