diff --git a/.github/workflows/testcext.yml b/.github/workflows/testcext.yml
index 34d23fc17..5c012de0d 100644
--- a/.github/workflows/testcext.yml
+++ b/.github/workflows/testcext.yml
@@ -26,7 +26,7 @@ jobs:
         python -m pip install setuptools wheel pytest pyparsing fonttools numpy Pillow
     - name: Install with C-extensions
       run: |
-        python setup.py install
+        python -m pip install .
     - name: Test with C-extensions
       run: |
         python -m pytest tests integration_tests
diff --git a/.github/workflows/testing.yml b/.github/workflows/testing.yml
index a32b058dc..5b6760815 100644
--- a/.github/workflows/testing.yml
+++ b/.github/workflows/testing.yml
@@ -28,7 +28,7 @@ jobs:
         python -m pip install setuptools wheel pytest pyparsing fonttools numpy Pillow
     - name: Install without C-extensions
       run: |
-        python setup.py install
+        python -m pip install .
     - name: Test without C-extensions
       run: |
         python -m pytest tests integration_tests