@@ -76,6 +76,9 @@ jobs:
             # https://bugreports.qt.io/projects/PYSIDE/issues/PYSIDE-2346
             pyside6-ver: '!=6.5.1'
             extra-requirements: '-r requirements/testing/extra.txt'
+          - os: ubuntu-22.04
+            python-version: '3.12-dev'
+            pyside6-ver: '!=6.5.1'
           - os: macos-latest
             python-version: 3.9
             # https://bugreports.qt.io/projects/PYSIDE/issues/PYSIDE-2346
@@ -191,8 +194,10 @@ jobs:
           python -m pip install --upgrade pip setuptools wheel
 
           # Install pre-release versions during our weekly upcoming dependency tests.
+          # Also install for 3.12 to get working NumPy (remove when 1.26 is released)
           if [[ "${{ github.event_name == 'schedule' &&
-                     matrix.name-suffix != '(Minimum Versions)' }}" = "true" ]]; then
+                     matrix.name-suffix != '(Minimum Versions)' }}" = "true"
+                || "${{ matrix.python-version}} == '3.12-dev' ]]; then
             PRE="--pre"
           fi
 
 
@@ -250,6 +250,9 @@ def test_pil_kwargs_tiff():
 
 
 def test_pil_kwargs_webp():
+    Image.init()
+    if "WEBP" not in Image.SAVE:
+        pytest.skip("No WEBP support")
     plt.plot([0, 1, 2], [0, 1, 0])
     buf_small = io.BytesIO()
     pil_kwargs_low = {"quality": 1}
@@ -263,6 +266,9 @@ def test_pil_kwargs_webp():
 
 
 def test_webp_alpha():
+    Image.init()
+    if "WEBP" not in Image.SAVE:
+        pytest.skip("No WEBP support")
     plt.plot([0, 1, 2], [0, 1, 0])
     buf = io.BytesIO()
     plt.savefig(buf, format="webp", transparent=True)