diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c355b829..4d3d410b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -46,7 +46,7 @@ jobs:
     - name: Set up Python
       uses: actions/setup-python@v4
       with:
-        python-version: 3.10
+        python-version: 3.9
     - run: pip install pip-tools pandas pyarrow openpyxl click tox
 
     - name: Extract Spec