diff --git a/.github/workflows/ci_unidock.yml b/.github/workflows/ci_unidock.yml
index 47544f4..6ef9662 100644
--- a/.github/workflows/ci_unidock.yml
+++ b/.github/workflows/ci_unidock.yml
@@ -45,7 +45,7 @@ jobs:
     - name: Set up Python 3.10
       uses: actions/setup-python@v3
       with:
-        python-version: 3.10
+        python-version: '3.10'
 
     - name: perform unit-test
       run: |