diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index fb4c48fd..ada6777c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.x"
+          python-version: "3.9"
       - name: Install required packages
         run: pip install setuptools atexit
       - name: Build a source tarball