diff --git a/.github/workflows/python-unit-test.yml b/.github/workflows/python-unit-test.yml
index c6a6b77..d4e6140 100644
--- a/.github/workflows/python-unit-test.yml
+++ b/.github/workflows/python-unit-test.yml
@@ -42,7 +42,14 @@ jobs:
       - name: checkout PR
         uses: actions/checkout@v3
 
-      - name: Set up Python
+      - name: Set up Python 2.7
+        if: ${{ matrix.pyver_os.ver == '2.7' }}
+        run: |
+          set -euxo pipefail
+          sudo apt install -y python2.7
+
+      - name: Set up Python 3
+        if: ${{ matrix.pyver_os.ver != '2.7' }}
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.pyver_os.ver }}