diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 2c794033a494..c9a3ec83b70d 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -134,6 +134,9 @@ stages:
- script: env
displayName: 'print env'
+ - script: pip list
+ displayName: 'print pip'
+
- bash: |
PYTHONFAULTHANDLER=1 python -m pytest --junitxml=junit/test-results.xml -raR --maxfail=50 --timeout=300 --durations=25 --cov-report= --cov=lib -n 2 ||
[[ "$PYTHON_VERSION" = 'Pre' ]]
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
index 9ca791db0c5a..d035d1680da1 100644
--- a/lib/matplotlib/backends/backend_pdf.py
+++ b/lib/matplotlib/backends/backend_pdf.py
@@ -1718,8 +1718,13 @@ def _writeImg(self, data, id, smask=None):
# Convert to indexed color if there are 256 colors or fewer
# This can significantly reduce the file size
num_colors = len(img_colors)
- img = img.convert(mode='P', dither=Image.NONE,
- palette=Image.ADAPTIVE, colors=num_colors)
+ # These constants were converted to IntEnums and deprecated in
+ # Pillow 9.2
+ dither = getattr(Image, 'Dither', Image).NONE
+ pmode = getattr(Image, 'Palette', Image).ADAPTIVE
+ img = img.convert(
+ mode='P', dither=dither, palette=pmode, colors=num_colors
+ )
png_data, bit_depth, palette = self._writePng(img)
if bit_depth is None or palette is None:
raise RuntimeError("invalid PNG header")
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