diff --git a/.github/workflows/test_04.abstract_base.yml b/.github/workflows/test_04.abstract_base.yml
index eb608d9f6..5cedff418 100644
--- a/.github/workflows/test_04.abstract_base.yml
+++ b/.github/workflows/test_04.abstract_base.yml
@@ -41,7 +41,7 @@ jobs:
       - name: 'set up Python'
         uses: actions/setup-python@v3
         with:
-          python-version: '3.12'
+          python-version: '3.12.3'
       
       - name: 'set up Python dependencies'
         shell: bash