diff --git a/src/Updater.php b/src/Updater.php
index b5751a48c23450186865b1243efd4f1c4c22d37d..7c2c3510382991acffc37afbcde786dad1af4921 100644
--- a/src/Updater.php
+++ b/src/Updater.php
@@ -168,30 +168,37 @@ class Updater {
   }
 
   /**
-   * Gets directories that should be excluded from the staging area.
+   * Gets the paths that should be excluded from the staging area.
    *
    * @return string[]
-   *   The absolute paths of directories to exclude from the staging area.
+   *   The paths relative to the active directory to exclude.
    */
   private function getExclusions(): array {
-    $directories = [];
+    $exclusions = [];
     $make_relative = function ($path) {
       return str_replace(static::getActiveDirectory() . '/', '', $path);
     };
     if ($public = $this->fileSystem->realpath('public://')) {
-      $directories[] = $make_relative($public);
+      $exclusions[] = $make_relative($public);
     }
     if ($private = $this->fileSystem->realpath('private://')) {
-      $directories[] = $make_relative($private);
+      $exclusions[] = $make_relative($private);
     }
     /** @var \Drupal\Core\Extension\ModuleHandlerInterface $module_handler */
     $module_handler = \Drupal::service('module_handler');
     $module_path = $this->fileSystem->realpath($module_handler->getModule('automatic_updates')->getPath());
     if (is_dir("$module_path/.git")) {
       // If the current module is git clone. Don't copy it.
-      $directories[] = $make_relative($module_path);
+      $exclusions[] = $make_relative($module_path);
     }
-    return $directories;
+    $settings_files = ['settings.php', 'settings.local.php', 'services.yml'];
+    foreach ($settings_files as $settings_file) {
+      $file_path = "sites/default/$settings_file";
+      if (file_exists($file_path)) {
+        $exclusions[] = $make_relative($this->fileSystem->realpath("sites/default/$settings_file"));
+      }
+    }
+    return $exclusions;
   }
 
   /**
diff --git a/tests/src/Build/AttendedCoreUpdateTest.php b/tests/src/Build/AttendedCoreUpdateTest.php
index 23cfc81147f7c53fa3b771761e041e892c4b1a5a..8f1d67c647d7c8a13022d6244704b83378b8e244 100644
--- a/tests/src/Build/AttendedCoreUpdateTest.php
+++ b/tests/src/Build/AttendedCoreUpdateTest.php
@@ -123,9 +123,7 @@ class AttendedCoreUpdateTest extends AttendedUpdateTestBase {
     $assert_session->pageTextContains('Ready to update');
     $page->pressButton('Continue');
     $this->waitForBatchJob();
-    // @todo This message isn't showing up, for some reason. Figure out what the
-    // eff is going on.
-    // $assert_session->pageTextContains('Update complete!');
+    $assert_session->pageTextContains('Update complete!');
     $this->assertCoreVersion('9.8.1');
 
     $placeholder = file_get_contents($this->getWorkspaceDirectory() . '/core/README.txt');