diff --git a/tools/ci/python_packages/tiny_test_fw/Utility/GitlabCIJob.py b/tools/ci/python_packages/tiny_test_fw/Utility/GitlabCIJob.py
index e6173b035c..c5c9a66c66 100644
--- a/tools/ci/python_packages/tiny_test_fw/Utility/GitlabCIJob.py
+++ b/tools/ci/python_packages/tiny_test_fw/Utility/GitlabCIJob.py
@@ -62,4 +62,4 @@ class Job(dict):
         file_name = os.path.join(file_path, self["name"] + ".yml")
         if "case group" in self:
             with open(file_name, "w") as f:
-                yaml.dump(self["case group"].output(), f, default_flow_style=False)
+                yaml.safe_dump(self["case group"].output(), f, encoding='utf-8', default_flow_style=False)