diff --git a/.github/workflows/test_qlib_from_source_slow.yml b/.github/workflows/test_qlib_from_source_slow.yml
index caab6f444..d36d217ad 100644
--- a/.github/workflows/test_qlib_from_source_slow.yml
+++ b/.github/workflows/test_qlib_from_source_slow.yml
@@ -37,6 +37,12 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Set up Python ${{ matrix.python-version }}
+      if: (matrix.python-version != '3.8')
+      uses: actions/setup-python@v4
+      with:
+        python-version: "3.8.17"
+
     - name: Set up Python tools
       run: |
         python -m pip install --upgrade pip