diff --git a/core/modules/migrate_drupal/tests/fixtures/drupal7.php b/core/modules/migrate_drupal/tests/fixtures/drupal7.php
index 6d6cc49..f6303dd 100644
--- a/core/modules/migrate_drupal/tests/fixtures/drupal7.php
+++ b/core/modules/migrate_drupal/tests/fixtures/drupal7.php
@@ -44320,6 +44320,14 @@
   'value' => 'a:16:{s:11:"toggle_logo";i:0;s:11:"toggle_name";i:1;s:13:"toggle_slogan";i:0;s:24:"toggle_node_user_picture";i:0;s:27:"toggle_comment_user_picture";i:0;s:32:"toggle_comment_user_verification";i:0;s:14:"toggle_favicon";i:0;s:16:"toggle_main_menu";i:0;s:21:"toggle_secondary_menu";i:0;s:12:"default_logo";i:1;s:9:"logo_path";s:23:"public://customlogo.png";s:11:"logo_upload";s:0:"";s:15:"default_favicon";i:0;s:12:"favicon_path";s:24:"public://somefavicon.png";s:14:"favicon_upload";s:0:"";s:16:"favicon_mimetype";s:9:"image/png";}',
 ))
 ->values(array(
+  'name' => 'theme_bartik_settings',
+  'value' => 'a:18:{s:11:"toggle_logo";i:1;s:11:"toggle_name";i:1;s:13:"toggle_slogan";i:1;s:24:"toggle_node_user_picture";i:1;s:27:"toggle_comment_user_picture";i:1;s:32:"toggle_comment_user_verification";i:1;s:14:"toggle_favicon";i:1;s:16:"toggle_main_menu";i:1;s:21:"toggle_secondary_menu";i:1;s:12:"default_logo";i:0;s:9:"logo_path";s:16:"public://gnu.png";s:15:"default_favicon";i:1;s:12:"favicon_path";s:0:"";s:14:"favicon_upload";s:0:"";s:6:"scheme";s:7:"default";s:7:"palette";a:9:{s:3:"top";s:7:"#0779bf";s:6:"bottom";s:7:"#48a9e4";s:2:"bg";s:7:"#ffffff";s:7:"sidebar";s:7:"#f6f6f2";s:14:"sidebarborders";s:7:"#f9f9f9";s:6:"footer";s:7:"#292929";s:11:"titleslogan";s:7:"#fffeff";s:4:"text";s:7:"#3b3b3b";s:4:"link";s:7:"#0071B3";}s:5:"theme";s:6:"bartik";s:4:"info";a:12:{s:6:"fields";a:9:{s:3:"top";s:10:"Header top";s:6:"bottom";s:13:"Header bottom";s:2:"bg";s:15:"Main background";s:7:"sidebar";s:18:"Sidebar background";s:14:"sidebarborders";s:15:"Sidebar borders";s:6:"footer";s:17:"Footer background";s:11:"titleslogan";s:16:"Title and slogan";s:4:"text";s:10:"Text color";s:4:"link";s:10:"Link color";}s:7:"schemes";a:6:{s:7:"default";a:2:{s:5:"title";s:21:"Blue Lagoon (default)";s:6:"colors";a:9:{s:3:"top";s:7:"#0779bf";s:6:"bottom";s:7:"#48a9e4";s:2:"bg";s:7:"#ffffff";s:7:"sidebar";s:7:"#f6f6f2";s:14:"sidebarborders";s:7:"#f9f9f9";s:6:"footer";s:7:"#292929";s:11:"titleslogan";s:7:"#fffeff";s:4:"text";s:7:"#3b3b3b";s:4:"link";s:7:"#0071B3";}}s:9:"firehouse";a:2:{s:5:"title";s:9:"Firehouse";s:6:"colors";a:9:{s:3:"top";s:7:"#cd2d2d";s:6:"bottom";s:7:"#cf3535";s:2:"bg";s:7:"#ffffff";s:7:"sidebar";s:7:"#f1f4f0";s:14:"sidebarborders";s:7:"#ededed";s:6:"footer";s:7:"#1f1d1c";s:11:"titleslogan";s:7:"#fffeff";s:4:"text";s:7:"#3b3b3b";s:4:"link";s:7:"#d6121f";}}s:3:"ice";a:2:{s:5:"title";s:3:"Ice";s:6:"colors";a:9:{s:3:"top";s:7:"#d0d0d0";s:6:"bottom";s:7:"#c2c4c5";s:2:"bg";s:7:"#ffffff";s:7:"sidebar";s:7:"#ffffff";s:14:"sidebarborders";s:7:"#cccccc";s:6:"footer";s:7:"#24272c";s:11:"titleslogan";s:7:"#000000";s:4:"text";s:7:"#4a4a4a";s:4:"link";s:7:"#019dbf";}}s:4:"plum";a:2:{s:5:"title";s:4:"Plum";s:6:"colors";a:9:{s:3:"top";s:7:"#4c1c58";s:6:"bottom";s:7:"#593662";s:2:"bg";s:7:"#fffdf7";s:7:"sidebar";s:7:"#edede7";s:14:"sidebarborders";s:7:"#e7e7e7";s:6:"footer";s:7:"#2c2c28";s:11:"titleslogan";s:7:"#ffffff";s:4:"text";s:7:"#301313";s:4:"link";s:7:"#9d408d";}}s:5:"slate";a:2:{s:5:"title";s:5:"Slate";s:6:"colors";a:9:{s:3:"top";s:7:"#4a4a4a";s:6:"bottom";s:7:"#4e4e4e";s:2:"bg";s:7:"#ffffff";s:7:"sidebar";s:7:"#ffffff";s:14:"sidebarborders";s:7:"#d0d0d0";s:6:"footer";s:7:"#161617";s:11:"titleslogan";s:7:"#ffffff";s:4:"text";s:7:"#3b3b3b";s:4:"link";s:7:"#0073b6";}}s:0:"";a:2:{s:5:"title";s:6:"Custom";s:6:"colors";a:0:{}}}s:3:"css";a:1:{i:0;s:14:"css/colors.css";}s:4:"copy";a:1:{i:0;s:8:"logo.png";}s:9:"gradients";a:1:{i:0;a:3:{s:9:"dimension";a:4:{i:0;i:0;i:1;i:0;i:2;i:0;i:3;i:0;}s:9:"direction";s:8:"vertical";s:6:"colors";a:2:{i:0;s:3:"top";i:1;s:6:"bottom";}}}s:4:"fill";a:0:{}s:6:"slices";a:0:{}s:12:"blend_target";s:7:"#ffffff";s:11:"preview_css";s:17:"color/preview.css";s:10:"preview_js";s:16:"color/preview.js";s:12:"preview_html";s:18:"color/preview.html";s:10:"base_image";s:14:"color/base.png";}}',
+))
+->values(array(
+  'name' => 'theme_seven_settings',
+  'value' => 'a:15:{s:11:"toggle_logo";i:1;s:11:"toggle_name";i:1;s:13:"toggle_slogan";i:1;s:24:"toggle_node_user_picture";i:1;s:27:"toggle_comment_user_picture";i:0;s:32:"toggle_comment_user_verification";i:1;s:14:"toggle_favicon";i:1;s:16:"toggle_main_menu";i:1;s:21:"toggle_secondary_menu";i:0;s:12:"default_logo";i:1;s:9:"logo_path";s:0:"";s:11:"logo_upload";s:0:"";s:15:"default_favicon";i:1;s:12:"favicon_path";s:0:"";s:14:"favicon_upload";s:0:"";}',
+))
+->values(array(
   'name' => 'tracker_batch_size',
   'value' => 'i:999;',
 ))
diff --git a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
index 6b1fc1b..21950b4 100644
--- a/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
+++ b/core/modules/migrate_drupal_ui/src/Form/MigrateUpgradeForm.php
@@ -582,6 +582,10 @@ class MigrateUpgradeForm extends ConfirmFormBase {
       'source_module' => 'profile',
       'destination_module' => 'user',
     ],
+    'd7_theme_settings' => [
+      'source_module' => 'system',
+      'destination_module' => 'system',
+    ],
     'd6_user' => [
       'source_module' => 'user',
       'destination_module' => 'user',