diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5a0a64d4..704be58b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -40,7 +40,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        pip install pytest
+        pip install pytest typing_extensions
     - name: Run tests
       run: python tools/snippets pytest -v tests