diff --git a/main.py b/main.py
index d6f8a94..39acb36 100644
--- a/main.py
+++ b/main.py
@@ -6,6 +6,7 @@ import sys
 
 from atproto import Client, models
 from bs4 import BeautifulSoup
+from requests.exceptions import Timeout
 import requests
 
 from ai.talk import Talk
@@ -95,8 +96,13 @@ def main (
 
             uri = f"https://www.nicovideo.jp/watch/{ datum['contentId'] }"
             (title, description, thumbnail) = get_embed_info (uri)
-            upload = client.com.atproto.repo.upload_blob (
-                    io.BytesIO (requests.get (thumbnail).content))
+            try:
+                upload = client.com.atproto.repo.upload_blob (
+                        io.BytesIO (requests.get (thumbnail,
+                                                  timeout = 60).content))
+                thumb = upload.blob
+            except Timeout:
+                thumb = None
 
             embed_external = models.AppBskyEmbedExternal.Main (
                     external = models.AppBskyEmbedExternal.External (
@@ -155,7 +161,7 @@ def get_nico_deerjika ():
            '/contents/search')
 
     now = datetime.now ()
-    base = now - timedelta (hours = 1)
+    base = now - timedelta (hours = 4)
 
     params = { 'q':          '伊地知ニジカ',
                'targets':    'tags',
@@ -173,7 +179,10 @@ def get_nico_deerjika ():
                               % (now.year, now.month, now.day)),
             'include_lower': True }] }) }
 
-    res = requests.get (URL, params = params).json ()
+    try:
+        res = requests.get (URL, params = params, timeout = 60).json ()
+    except Timeout:
+        return []
 
     data = []
     for datum in res['data']:
@@ -192,7 +201,7 @@ def get_embed_info (
 
     try:
         res = requests.get (url, timeout = 60)
-    except Exception:
+    except Timeout:
         return ('', '', '')
 
     if res.status_code != 200: