diff --git a/main.py b/main.py
index 04566e5..da16e3f 100644
--- a/main.py
+++ b/main.py
@@ -1,4 +1,5 @@
 from datetime import datetime, timedelta
+import io
 import json
 import time
 import sys
@@ -93,12 +94,14 @@ def main (
             watched_videos += [datum['contentId']]
 
             uri = f"https://www.nicovideo.jp/watch/{ datum['contentId'] }"
-            (title, description, thumb) = get_embed_info (uri)
+            (title, description, thumbnail) = get_embed_info (uri)
+
             embed_external = models.AppBskyEmbedExternal.Main (
                     external = models.AppBskyEmbedExternal.External (
                         title       = title,
                         description = description,
-                        thumb       = thumb,
+                        thumb       = client.com.atproto.repo.upload_blob (
+                            io.BytesIO (requests.get (thumbnail).content)),
                         uri         = uri))
             client.post (Talk.main (f"""
 ニコニコに『{ datum['title'] }』という動画がアップされました。