diff --git a/.github/workflows/pypi-publish.yml b/.github/workflows/pypi-publish.yml
index afb06285..265789e8 100644
--- a/.github/workflows/pypi-publish.yml
+++ b/.github/workflows/pypi-publish.yml
@@ -17,6 +17,10 @@ jobs:
         with:
           ref: ${{ github.event.release.tag_name }}
 
+      - uses: actions/setup-python@v5
+        with:
+            python-version: '3.9.6'
+
       - name: Setup PDM
         uses: pdm-project/setup-pdm@v4
         with: