diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1309,7 +1309,6 @@
     'PhabricatorBotBaseStreamingProtocolAdapter' => 'infrastructure/daemon/bot/adapter/PhabricatorBotBaseStreamingProtocolAdapter.php',
     'PhabricatorBotChannel' => 'infrastructure/daemon/bot/target/PhabricatorBotChannel.php',
     'PhabricatorBotDebugLogHandler' => 'infrastructure/daemon/bot/handler/PhabricatorBotDebugLogHandler.php',
-    'PhabricatorBotDifferentialNotificationHandler' => 'infrastructure/daemon/bot/handler/PhabricatorBotDifferentialNotificationHandler.php',
     'PhabricatorBotFeedNotificationHandler' => 'infrastructure/daemon/bot/handler/PhabricatorBotFeedNotificationHandler.php',
     'PhabricatorBotFlowdockProtocolAdapter' => 'infrastructure/daemon/bot/adapter/PhabricatorBotFlowdockProtocolAdapter.php',
     'PhabricatorBotHandler' => 'infrastructure/daemon/bot/handler/PhabricatorBotHandler.php',
@@ -4104,7 +4103,6 @@
     'PhabricatorBotBaseStreamingProtocolAdapter' => 'PhabricatorBaseProtocolAdapter',
     'PhabricatorBotChannel' => 'PhabricatorBotTarget',
     'PhabricatorBotDebugLogHandler' => 'PhabricatorBotHandler',
-    'PhabricatorBotDifferentialNotificationHandler' => 'PhabricatorBotHandler',
     'PhabricatorBotFeedNotificationHandler' => 'PhabricatorBotHandler',
     'PhabricatorBotFlowdockProtocolAdapter' => 'PhabricatorBotBaseStreamingProtocolAdapter',
     'PhabricatorBotLogHandler' => 'PhabricatorBotHandler',
diff --git a/src/infrastructure/daemon/bot/handler/PhabricatorBotDifferentialNotificationHandler.php b/src/infrastructure/daemon/bot/handler/PhabricatorBotDifferentialNotificationHandler.php
deleted file mode 100644
--- a/src/infrastructure/daemon/bot/handler/PhabricatorBotDifferentialNotificationHandler.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-
-/**
- * @deprecated
- */
-final class PhabricatorBotDifferentialNotificationHandler
-  extends PhabricatorBotHandler {
-
-  public function receiveMessage(PhabricatorBotMessage $message) {
-    static $notified;
-    if (!$notified) {
-      phlog(
-        'PhabricatorBotDifferentialNotificationHandler is deprecated, use '.
-        'PhabricatorBotFeedNotificationHandler instead.');
-      $notified = true;
-    }
-  }
-
-}