diff --git a/src/applications/differential/controller/DifferentialDiffViewController.php b/src/applications/differential/controller/DifferentialDiffViewController.php
--- a/src/applications/differential/controller/DifferentialDiffViewController.php
+++ b/src/applications/differential/controller/DifferentialDiffViewController.php
@@ -38,19 +38,10 @@
       pht('Create a new Revision...'));
     $select[] = hsprintf('</optgroup>');
 
-    $revisions = id(new DifferentialRevisionQuery())
-      ->setViewer($viewer)
-      ->withAuthors(array($viewer->getPHID()))
-      ->withStatus(DifferentialRevisionQuery::STATUS_OPEN)
-      ->requireCapabilities(
-        array(
-          PhabricatorPolicyCapability::CAN_VIEW,
-          PhabricatorPolicyCapability::CAN_EDIT,
-        ))
-      ->execute();
-
     $selected_id = $request->getInt('revisionID');
 
+    $revisions = $this->loadSelectableRevisions($viewer, $selected_id);
+
     if ($revisions) {
       $select[] = hsprintf(
         '<optgroup label="%s">',
@@ -153,4 +144,45 @@
       ));
   }
 
+  private function loadSelectableRevisions(
+    PhabricatorUser $viewer,
+    $selected_id) {
+
+    $revisions = id(new DifferentialRevisionQuery())
+      ->setViewer($viewer)
+      ->withAuthors(array($viewer->getPHID()))
+      ->withStatus(DifferentialRevisionQuery::STATUS_OPEN)
+      ->requireCapabilities(
+        array(
+          PhabricatorPolicyCapability::CAN_VIEW,
+          PhabricatorPolicyCapability::CAN_EDIT,
+        ))
+      ->execute();
+    $revisions = mpull($revisions, null, 'getID');
+
+    // If a specific revision is selected (for example, because the user is
+    // following the "Update Diff" workflow), but not present in the dropdown,
+    // try to add it to the dropdown even if it is closed. This allows the
+    // workflow to be used to update abandoned revisions.
+
+    if ($selected_id) {
+      if (empty($revisions[$selected_id])) {
+        $selected = id(new DifferentialRevisionQuery())
+          ->setViewer($viewer)
+          ->withAuthors(array($viewer->getPHID()))
+          ->withIDs(array($selected_id))
+          ->requireCapabilities(
+            array(
+              PhabricatorPolicyCapability::CAN_VIEW,
+              PhabricatorPolicyCapability::CAN_EDIT,
+            ))
+          ->execute();
+        $revisions = mpull($selected, null, 'getID') + $revisions;
+      }
+    }
+
+    return $revisions;
+  }
+
+
 }
diff --git a/src/applications/differential/editor/DifferentialTransactionEditor.php b/src/applications/differential/editor/DifferentialTransactionEditor.php
--- a/src/applications/differential/editor/DifferentialTransactionEditor.php
+++ b/src/applications/differential/editor/DifferentialTransactionEditor.php
@@ -187,6 +187,7 @@
     $status_review = ArcanistDifferentialRevisionStatus::NEEDS_REVIEW;
     $status_revision = ArcanistDifferentialRevisionStatus::NEEDS_REVISION;
     $status_plan = ArcanistDifferentialRevisionStatus::CHANGES_PLANNED;
+    $status_abandoned = ArcanistDifferentialRevisionStatus::ABANDONED;
 
     switch ($xaction->getTransactionType()) {
       case PhabricatorTransactions::TYPE_VIEW_POLICY:
@@ -202,10 +203,14 @@
       case PhabricatorTransactions::TYPE_EDGE:
         return;
       case DifferentialTransaction::TYPE_UPDATE:
-        if (!$this->getIsCloseByCommit() &&
-            (($object->getStatus() == $status_revision) ||
-             ($object->getStatus() == $status_plan))) {
-          $object->setStatus($status_review);
+        if (!$this->getIsCloseByCommit()) {
+          switch ($object->getStatus()) {
+            case $status_revision:
+            case $status_plan:
+            case $status_abandoned:
+              $object->setStatus($status_review);
+              break;
+          }
         }
 
         $diff = $this->requireDiff($xaction->getNewValue());