diff --git a/src/workflow/ArcanistDiffWorkflow.php b/src/workflow/ArcanistDiffWorkflow.php
--- a/src/workflow/ArcanistDiffWorkflow.php
+++ b/src/workflow/ArcanistDiffWorkflow.php
@@ -965,8 +965,8 @@
         'and not as well for large automated changes or bulk checkins. '.
         'See %s for information about reviewing big checkins. Continue anyway?',
         new PhutilNumber(count($changes)),
-        'http://www.phabricator.com/docs/phabricator/article/'.
-        'Differential_User_Guide_Large_Changes.html');
+        'https://secure.phabricator.com/book/phabricator/article/'.
+          'differential_large_changes/');
 
       if (!phutil_console_confirm($message)) {
         throw new ArcanistUsageException(
diff --git a/src/workflow/ArcanistWorkflow.php b/src/workflow/ArcanistWorkflow.php
--- a/src/workflow/ArcanistWorkflow.php
+++ b/src/workflow/ArcanistWorkflow.php
@@ -1589,8 +1589,8 @@
           pht(
             'This feature requires a newer version of Phabricator. Please '.
             'update it using these instructions: %s',
-            'http://www.phabricator.com/docs/phabricator/article/'.
-            'Installation_Guide.html#updating-phabricator'));
+            'https://secure.phabricator.com/book/phabricator/article/'.
+              'upgrading/'));
       }
       throw $ex;
     }