diff --git a/.github/workflows/test_upb.yml b/.github/workflows/test_upb.yml
index a71559c3a7..970d93eff8 100644
--- a/.github/workflows/test_upb.yml
+++ b/.github/workflows/test_upb.yml
@@ -118,6 +118,7 @@ jobs:
       - name: "Setup Python"
         uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1 # v4.7.0
         with:
+          python-version: 3.12
           cache: pip
           cache-dependency-path: 'python/requirements.txt'
       - name: Run tests