diff --git a/slack-pixiv/app.rb b/slack-pixiv/app.rb
index a933a7a..d824ef9 100644
--- a/slack-pixiv/app.rb
+++ b/slack-pixiv/app.rb
@@ -1,4 +1,5 @@
 module SlackPixiv
   class App < SlackRubyBot::App
+    SlackRubyBot::Client.logger.level = Logger::WARN
   end
 end