diff --git a/json_to_md.py b/json_to_md.py
index 7e1e5ca..a5d6a8a 100644
--- a/json_to_md.py
+++ b/json_to_md.py
@@ -366,6 +366,7 @@ def run_pytest_and_generate_banner_with_logs(md_path, log_path, exit_code):
 
     try:
         with open(md_path, "w") as f:
+            full_banner = full_banner.encode('utf-8', 'ignore').decode('utf-8')
             f.write(full_banner + original_md)
         print("✅ Banner and log summary added to markdown report.")
     except Exception as e: