diff --git a/.github/workflows/style_type_checks.yml b/.github/workflows/style_type_checks.yml
index a5d1721deb..f8ffcc4ca8 100644
--- a/.github/workflows/style_type_checks.yml
+++ b/.github/workflows/style_type_checks.yml
@@ -22,6 +22,7 @@ jobs:
         pip install click black mypy
         pip install types-python-dateutil
         pip install types-waitress
+        pip install types-PyYAML
     - name: Style and type checks
       run: |
         just black