diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index c8842e37b..f6d0aeb1d 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -80,6 +80,12 @@ jobs:
         pytest-cov
         pytest-timeout
 
+    - name: Install CPython dependencies
+      if: "!contains(matrix.python-version, 'pypy')"
+      run: >
+        python3 -m pip install
+        PyQt6
+
     - name: Install dependencies
       id: install
       run: |
diff --git a/CHANGES.rst b/CHANGES.rst
index 87945bc84..9d45e2214 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,9 @@ Changelog (Pillow)
 11.1.0 (unreleased)
 -------------------
 
+- Detach PyQt6 QPixmap instance before returning #8509
+  [radarhere]
+
 - Corrected EMF DPI #8485
   [radarhere]
 
diff --git a/src/PIL/ImageQt.py b/src/PIL/ImageQt.py
index a3d647138..2cc40f855 100644
--- a/src/PIL/ImageQt.py
+++ b/src/PIL/ImageQt.py
@@ -213,4 +213,7 @@ def toqimage(im: Image.Image | str | QByteArray) -> ImageQt:
 
 def toqpixmap(im: Image.Image | str | QByteArray) -> QPixmap:
     qimage = toqimage(im)
-    return getattr(QPixmap, "fromImage")(qimage)
+    pixmap = getattr(QPixmap, "fromImage")(qimage)
+    if qt_version == "6":
+        pixmap.detach()
+    return pixmap