Increase Pillow dependency range to include 10.x

- Drop support for Pillow versions below `9.1.0`
- Fixes #10631

CHANGELOG.txt

@@ -69,6 +69,7 @@ Changelog
  * Maintenance: Refactor GroupPagePermission to use Django's Permission model (Sage Abdullah)
  * Maintenance: Convert the CONTRIBUTORS file to Markdown (Dan Braghis)
  * Maintenance: Move `django-filter` version upper bound to v24 (Yuekui)
+ * Maintenance: Update Pillow dependency to allow 10.x, only include support for >= 9.1.0 (Yuekui)
 
 
 5.0.2 (21.06.2023)

docs/releases/5.1.md

@@ -103,10 +103,15 @@ Thank you to Damilola for his work, and to Google for sponsoring this project.
  * Refactor GroupPagePermission to use Django's Permission model (Sage Abdullah)
  * Convert the `CONTRIBUTORS` file to Markdown (Dan Braghis)
  * Move `django-filter` version upper bound to v24 (Yuekui)
+ * Update Pillow dependency to allow 10.x, only include support for >= 9.1.0 (Yuekui)
 
 
 ## Upgrade considerations
 
+## Pillow dependency update
+
+Wagtail no longer supports Pillow versions below `9.1.0`.
+
 ### `insert_editor_css` hook is deprecated
 
 The `insert_editor_css` hook has been deprecated. The `insert_global_admin_css` hook has the same functionality, and all uses of `insert_editor_css` should be changed to `insert_global_admin_css`.

setup.py

@@ -27,7 +27,7 @@ install_requires = [
     "djangorestframework>=3.11.1,<4.0",
     "django-filter>=2.2,<24",
     "draftjs_exporter>=2.1.5,<3.0",
-    "Pillow>=4.0.0,<10.0.0",
+    "Pillow>=9.1.0,<11.0.0",
     "beautifulsoup4>=4.8,<4.12",
     "html5lib>=0.999,<2",
     "Willow>=1.5,<1.6",