diff --git a/.github/workflows/cicd.yaml b/.github/workflows/cicd.yaml
index ac87a3c54..b207bd490 100644
--- a/.github/workflows/cicd.yaml
+++ b/.github/workflows/cicd.yaml
@@ -105,10 +105,10 @@ jobs:
       - name: Install poetry
         run: pipx install poetry
 
-      - name: setup python 3.9
+      - name: setup python 3.8
         uses: actions/setup-python@v5
         with:
-          python-version: 3.9
+          python-version: 3.8
           cache: "poetry"
 
       - name: Install dependencies
diff --git a/tests/submissions/test_optional_input_parameter.py b/tests/submissions/test_optional_input_parameter.py
index c72ccc994..6a8f81ea8 100644
--- a/tests/submissions/test_optional_input_parameter.py
+++ b/tests/submissions/test_optional_input_parameter.py
@@ -12,7 +12,7 @@
 @script(outputs=Parameter(name="message-out", value_from={"path": "/tmp/message-out"}))
 def print_msg(message: Optional[str] = None):
     with open("/tmp/message-out", "w") as f:
-        f.write(f"Got: {message}")
+        f.write("Got: {}".format(message))
 
 
 def get_workflow() -> Workflow: