diff --git a/src/firebase_functions/logger.py b/src/firebase_functions/logger.py
index 9b61ea6..0285a7b 100644
--- a/src/firebase_functions/logger.py
+++ b/src/firebase_functions/logger.py
@@ -44,9 +44,8 @@ def _entry_from_args(severity: LogSeverity, *args, **kwargs) -> LogEntry:
     """
 
     message: str = " ".join([
-        value
-        if isinstance(value, str) else _json.dumps(_remove_circular(value))
-        for value in args
+        value if isinstance(value, str) else _json.dumps(
+            _remove_circular(value), ensure_ascii=False) for value in args
     ])
 
     other: _typing.Dict[str, _typing.Any] = {
@@ -95,7 +94,8 @@ def _get_write_file(severity: LogSeverity) -> _typing.TextIO:
 
 def write(entry: LogEntry) -> None:
     write_file = _get_write_file(entry["severity"])
-    print(_json.dumps(_remove_circular(entry)), file=write_file)
+    print(_json.dumps(_remove_circular(entry), ensure_ascii=False),
+          file=write_file)
 
 
 def debug(*args, **kwargs) -> None: