diff --git a/.changes/cloud-bottle-dock-beginner.json b/.changes/cloud-bottle-dock-beginner.json
new file mode 100644
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+++ b/.changes/cloud-bottle-dock-beginner.json
@@ -0,0 +1 @@
+{"type":"MAJOR","changes":["Update the serialization of ImagePart to compress to JPEG encoding at 80% quality, from PNG encoding at 100% quality"]}