diff --git a/.github/workflows/publish_pypi.yml b/.github/workflows/publish_pypi.yml
index c7764ca..6ce6f96 100644
--- a/.github/workflows/publish_pypi.yml
+++ b/.github/workflows/publish_pypi.yml
@@ -8,7 +8,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.9'
       - name: Build a binary wheel and a source tarball
         run: |
           python -mpip install build