diff --git a/python/packages/magentic-one-cli/src/magentic_one_cli/_m1.py b/python/packages/magentic-one-cli/src/magentic_one_cli/_m1.py
index 1b159da4e91d..0a45711334d4 100644
--- a/python/packages/magentic-one-cli/src/magentic_one_cli/_m1.py
+++ b/python/packages/magentic-one-cli/src/magentic_one_cli/_m1.py
@@ -97,12 +97,12 @@ def main() -> None:
 
     if args.config is None:
         if os.path.isfile(DEFAULT_CONFIG_FILE):
-            with open(DEFAULT_CONFIG_FILE, "r") as f:
+            with open(DEFAULT_CONFIG_FILE, "r", encoding="utf-8") as f:
                 config = yaml.safe_load(f)
         else:
             config = yaml.safe_load(DEFAULT_CONFIG_CONTENTS)
     else:
-        with open(args.config if isinstance(args.config, str) else args.config[0], "r") as f:
+        with open(args.config if isinstance(args.config, str) else args.config[0], "r", encoding="utf-8") as f:
             config = yaml.safe_load(f)
 
     # Run the task