diff --git a/.github/workflows/test-wheels-pi_heif.yml b/.github/workflows/test-wheels-pi_heif.yml
index ab4f3577..ed43acbc 100644
--- a/.github/workflows/test-wheels-pi_heif.yml
+++ b/.github/workflows/test-wheels-pi_heif.yml
@@ -96,7 +96,8 @@ jobs:
 
       - name: Preparations
         run: |
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pi-heif
 
       - name: Test wheel
@@ -126,7 +127,8 @@ jobs:
       - name: Preparations
         run: |
           brew install libjpeg little-cms2
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pi-heif
 
       - name: Test wheel
@@ -158,7 +160,8 @@ jobs:
       - name: Preparations
         run: |
           sudo apt update && sudo apt install libjpeg-dev liblcms2-dev
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pi-heif
 
       - name: Test wheel
@@ -188,7 +191,8 @@ jobs:
       - name: Preparations
         run: |
           brew install libjpeg little-cms2
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pillow-heif
           python3 -m pip install --only-binary=:all: pi-heif
 
@@ -223,7 +227,8 @@ jobs:
       - name: Preparations
         run: |
           sudo apt update && sudo apt install libjpeg-dev liblcms2-dev
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pillow-heif
           python3 -m pip install --only-binary=:all: pi-heif
 
diff --git a/.github/workflows/test-wheels.yml b/.github/workflows/test-wheels.yml
index b34be83a..13629a0b 100644
--- a/.github/workflows/test-wheels.yml
+++ b/.github/workflows/test-wheels.yml
@@ -93,7 +93,8 @@ jobs:
 
       - name: Preparations
         run: |
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pillow_heif
 
       - name: Test wheel
@@ -120,7 +121,8 @@ jobs:
       - name: Preparations
         run: |
           brew install libjpeg little-cms2
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pillow_heif
 
       - name: Test wheel
@@ -150,7 +152,8 @@ jobs:
       - name: Preparations
         run: |
           sudo apt update && sudo apt install libjpeg-dev liblcms2-dev
-          python3 -m pip install pytest pillow packaging defusedxml
+          python3 -m pip install --prefer-binary pillow
+          python3 -m pip install pytest packaging defusedxml
           python3 -m pip install --only-binary=:all: pillow_heif
 
       - name: Test wheel