diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index 36981809..e4b517bd 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -40,6 +40,7 @@ jobs:
           pip install pytest-cov
           pip install pytest-benchmark
           pip install hypothesis
+          pip install typing_extensions
           pip freeze
 
       - name: Run tests