diff --git a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileExistingSettingsTest.php b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileExistingSettingsTest.php
index 7e19154118c..e8f77bd945c 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileExistingSettingsTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileExistingSettingsTest.php
@@ -38,7 +38,7 @@ class DistributionProfileExistingSettingsTest extends InstallerTestBase {
       'distribution' => [
         'name' => 'My Distribution',
         'install' => [
-          'theme' => 'bartik',
+          'theme' => 'olivero',
         ],
       ],
     ];
diff --git a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTest.php b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTest.php
index d8efca525c1..68a9cd1485c 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTest.php
@@ -32,7 +32,7 @@ class DistributionProfileTest extends InstallerTestBase {
       'distribution' => [
         'name' => 'My Distribution',
         'install' => [
-          'theme' => 'bartik',
+          'theme' => 'claro',
           'finish_url' => '/root-user',
         ],
       ],
diff --git a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationQueryTest.php b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationQueryTest.php
index a83452e3399..2f7e08a9209 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationQueryTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationQueryTest.php
@@ -43,7 +43,7 @@ class DistributionProfileTranslationQueryTest extends InstallerTestBase {
         'name' => 'My Distribution',
         'langcode' => $this->langcode,
         'install' => [
-          'theme' => 'bartik',
+          'theme' => 'claro',
         ],
       ],
     ];
diff --git a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationTest.php b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationTest.php
index 90c8c4c62c5..abf93bd65e8 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/DistributionProfileTranslationTest.php
@@ -45,7 +45,7 @@ class DistributionProfileTranslationTest extends InstallerTestBase {
         'name' => 'My Distribution',
         'langcode' => $this->langcode,
         'install' => [
-          'theme' => 'bartik',
+          'theme' => 'claro',
         ],
       ],
     ];
diff --git a/core/tests/Drupal/FunctionalTests/Installer/InstallerTest.php b/core/tests/Drupal/FunctionalTests/Installer/InstallerTest.php
index 4d1df63869e..12a2f0ddcf1 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/InstallerTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/InstallerTest.php
@@ -53,7 +53,7 @@ class InstallerTest extends InstallerTestBase {
   protected function setUpLanguage() {
     // Test that \Drupal\Core\Render\BareHtmlPageRenderer adds assets and
     // metatags as expected to the first page of the installer.
-    $this->assertSession()->responseContains("core/themes/claro/css/components/button.css");
+    $this->assertSession()->responseContains("css/components/button.css");
     $this->assertSession()->responseContains('<meta charset="utf-8" />');
 
     // Assert that the expected title is present.
diff --git a/core/tests/Drupal/FunctionalTests/Installer/MultipleDistributionsProfileTest.php b/core/tests/Drupal/FunctionalTests/Installer/MultipleDistributionsProfileTest.php
index ca71d7fb042..b7754682db4 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/MultipleDistributionsProfileTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/MultipleDistributionsProfileTest.php
@@ -37,7 +37,7 @@ class MultipleDistributionsProfileTest extends InstallerTestBase {
         'distribution' => [
           'name' => $name,
           'install' => [
-            'theme' => 'bartik',
+            'theme' => 'claro',
           ],
         ],
       ];
@@ -57,7 +57,7 @@ class MultipleDistributionsProfileTest extends InstallerTestBase {
     // Verify that the distribution name appears.
     $this->assertSession()->pageTextContains('distribution_one');
     // Verify that the requested theme is used.
-    $this->assertSession()->responseContains('bartik');
+    $this->assertSession()->responseContains('claro');
     // Verify that the "Choose profile" step does not appear.
     $this->assertSession()->pageTextNotContains('profile');
 
diff --git a/core/tests/Drupal/FunctionalTests/Installer/StandardInstallerTest.php b/core/tests/Drupal/FunctionalTests/Installer/StandardInstallerTest.php
index 7f9c0ae16a9..d49f373afeb 100644
--- a/core/tests/Drupal/FunctionalTests/Installer/StandardInstallerTest.php
+++ b/core/tests/Drupal/FunctionalTests/Installer/StandardInstallerTest.php
@@ -29,7 +29,7 @@ class StandardInstallerTest extends ConfigAfterInstallerTestBase {
   protected function setUpSite() {
     // Test that the correct theme is being used.
     $this->assertSession()->responseNotContains('olivero');
-    $this->assertSession()->responseContains('themes/claro/css/theme/install-page.css');
+    $this->assertSession()->responseContains('css/theme/install-page.css');
     parent::setUpSite();
   }