diff --git a/danmaku/youtube-live-chat-danmaku-ass.py b/danmaku/youtube-live-chat-danmaku-ass.py
index bb62377..2421ff1 100755
--- a/danmaku/youtube-live-chat-danmaku-ass.py
+++ b/danmaku/youtube-live-chat-danmaku-ass.py
@@ -380,12 +380,12 @@ def _load_mapped_emoji(self):
         path = self._get_mapped_emoji_path()
         if not os.path.isfile(path):
             return {}
-        with open(path) as f:
+        with open(path, encoding='utf-8') as f:
             return json.loads(f.read())
 
     def _save_mapped_emoji(self):
         path = self._get_mapped_emoji_path()
-        with open(path, 'w') as f:
+        with open(path, 'w', encoding='utf-8') as f:
             f.write(json.dumps(self._url_by_emoji))
 
     def _get_mapped_emoji_path(self):
@@ -547,8 +547,8 @@ def update_common_props(renderer):
 
 
 def main():
-    input_buffer = sys.stdin if sys.argv[1] == '-' else open(sys.argv[1], 'r')
-    output_buffer = sys.stdout if sys.argv[2] == '-' else open(sys.argv[2], 'w')
+    input_buffer = sys.stdin if sys.argv[1] == '-' else open(sys.argv[1], 'r', encoding="utf-8")
+    output_buffer = sys.stdout if sys.argv[2] == '-' else open(sys.argv[2], 'w', encoding="utf-8")
 
     ass_generator = DanmakuASSGenerator()
     parser = YoutubeLiveChatReplayParser()