diff --git a/codes/python/test_all.py b/codes/python/test_all.py
index eb4ca605ce..34235b8e55 100644
--- a/codes/python/test_all.py
+++ b/codes/python/test_all.py
@@ -13,6 +13,7 @@
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
             text=True,
+            encoding="utf-8",
         )
         # Wait for the process to complete, and get the output and error messages
         stdout, stderr = process.communicate()