diff --git a/core/modules/simpletest/src/Form/SimpletestResultsForm.php b/core/modules/simpletest/src/Form/SimpletestResultsForm.php
index 02e630732613..ead1767a3dbe 100644
--- a/core/modules/simpletest/src/Form/SimpletestResultsForm.php
+++ b/core/modules/simpletest/src/Form/SimpletestResultsForm.php
@@ -61,28 +61,28 @@ class SimpletestResultsForm extends FormBase {
     // Initialize image mapping property.
     $image_pass = array(
       '#theme' => 'image',
-      '#uri' => 'core/misc/icons/73b355/check.png',
+      '#uri' => 'core/misc/icons/73b355/check.svg',
       '#width' => 18,
       '#height' => 18,
       '#alt' => $this->t('Pass'),
     );
     $image_fail = array(
       '#theme' => 'image',
-      '#uri' => 'core/misc/icons/ea2800/error.png',
+      '#uri' => 'core/misc/icons/ea2800/error.svg',
       '#width' => 18,
       '#height' => 18,
       '#alt' => $this->t('Fail'),
     );
     $image_exception = array(
       '#theme' => 'image',
-      '#uri' => 'core/misc/icons/e29700/warning.png',
+      '#uri' => 'core/misc/icons/e29700/warning.svg',
       '#width' => 18,
       '#height' => 18,
       '#alt' => $this->t('Exception'),
     );
     $image_debug = array(
       '#theme' => 'image',
-      '#uri' => 'core/misc/icons/e29700/warning.png',
+      '#uri' => 'core/misc/icons/e29700/warning.svg',
       '#width' => 18,
       '#height' => 18,
       '#alt' => $this->t('Debug'),
diff --git a/core/modules/simpletest/src/Tests/SimpleTestTest.php b/core/modules/simpletest/src/Tests/SimpleTestTest.php
index fb6c2347594d..c644f6bceb92 100644
--- a/core/modules/simpletest/src/Tests/SimpleTestTest.php
+++ b/core/modules/simpletest/src/Tests/SimpleTestTest.php
@@ -348,7 +348,7 @@ EOD;
           $assertion['file'] = $this->asText($row->td[2]);
           $assertion['line'] = $this->asText($row->td[3]);
           $assertion['function'] = $this->asText($row->td[4]);
-          $ok_url = file_create_url('core/misc/icons/73b355/check.png');
+          $ok_url = file_create_url('core/misc/icons/73b355/check.svg');
           $assertion['status'] = ($row->td[5]->img['src'] == $ok_url) ? 'Pass' : 'Fail';
           $results['assertions'][] = $assertion;
         }
diff --git a/core/modules/update/update.report.inc b/core/modules/update/update.report.inc
index 62fa61339f4f..ad396c8fcbf5 100644
--- a/core/modules/update/update.report.inc
+++ b/core/modules/update/update.report.inc
@@ -320,25 +320,25 @@ function template_preprocess_update_project_status(&$variables) {
 
   switch ($project['status']) {
     case UPDATE_CURRENT:
-      $uri = 'core/misc/icons/73b355/check.png';
+      $uri = 'core/misc/icons/73b355/check.svg';
       $text = t('Ok');
       break;
     case UPDATE_UNKNOWN:
     case UPDATE_FETCH_PENDING:
     case UPDATE_NOT_FETCHED:
-      $uri = 'core/misc/icons/e29700/warning.png';
+      $uri = 'core/misc/icons/e29700/warning.svg';
       $text = t('Warning');
       break;
     case UPDATE_NOT_SECURE:
     case UPDATE_REVOKED:
     case UPDATE_NOT_SUPPORTED:
-      $uri = 'core/misc/icons/ea2800/error.png';
+      $uri = 'core/misc/icons/ea2800/error.svg';
       $text = t('Error');
       break;
     case UPDATE_NOT_CHECKED:
     case UPDATE_NOT_CURRENT:
     default:
-      $uri = 'core/misc/icons/e29700/warning.png';
+      $uri = 'core/misc/icons/e29700/warning.svg';
       $text = t('Warning');
       break;
   }