diff --git a/test/models/channel_last_speech_test.rb b/test/models/channel_last_speech_test.rb
index dbe7f77d..86d97c44 100644
--- a/test/models/channel_last_speech_test.rb
+++ b/test/models/channel_last_speech_test.rb
@@ -31,25 +31,29 @@ class ChannelLastSpeechTest < ActiveSupport::TestCase
 
   sub_test_case 'refresh!' do
     test 'チャンネル所属メッセージが複数ある場合、最新のメッセージが選ばれる' do
-      @channel.conversation_messages.delete_all
+      ConversationMessage.uncached do
+        @channel.conversation_messages.destroy_all
 
-      create(:privmsg)
-      privmsg_a = create(:privmsg_keyword_sw_a)
-      create(:privmsg_keyword_sw_k)
+        privmsg_a = create(:privmsg_keyword_sw_a)
+        create(:privmsg_keyword_sw_k)
+        p @channel.conversation_messages.map(&:message)
 
-      channel_last_speech = ChannelLastSpeech.refresh!(@channel)
+        ChannelLastSpeech.refresh!(@channel)
 
-      assert_equal(privmsg_a, @channel.last_speech)
-      refute_nil(channel_last_speech)
+        channel_last_speech = @channel.reload_channel_last_speech
+        refute_nil(channel_last_speech)
+        assert_equal(privmsg_a, channel_last_speech.conversation_message)
+      end
     end
 
     test 'チャンネル所属メッセージが存在しない場合、削除される' do
-      @channel.conversation_messages.delete_all
+      ConversationMessage.uncached do
+        @channel.conversation_messages.destroy_all
+        ChannelLastSpeech.refresh!(@channel)
 
-      channel_last_speech = ChannelLastSpeech.refresh!(@channel)
-
-      assert_nil(@channel.last_speech)
-      assert_nil(channel_last_speech)
+        channel_last_speech = @channel.reload_channel_last_speech
+        assert_nil(channel_last_speech)
+      end
     end
   end
 end