diff --git a/.github/workflows/check_config.yaml b/.github/workflows/check_config.yaml
index 254dbc9..3acb17a 100644
--- a/.github/workflows/check_config.yaml
+++ b/.github/workflows/check_config.yaml
@@ -23,4 +23,5 @@ jobs:
           python-version: 3.7
       - name: Run Checks
         run: |
+          pip install yaml
           python ci/check_mkdocs_config.py