diff -u b/core/lib/Drupal/Core/Render/Renderer.php b/core/lib/Drupal/Core/Render/Renderer.php
--- b/core/lib/Drupal/Core/Render/Renderer.php
+++ b/core/lib/Drupal/Core/Render/Renderer.php
@@ -669,7 +669,7 @@
     $attributes = new Attribute();
     $attributes['callback'] = $placeholder_render_array['#lazy_builder'][0];
     $attributes['arguments'] = UrlHelper::buildQuery($placeholder_render_array['#lazy_builder'][1]);
-    $attributes['token'] = crc32(serialize($placeholder_render_array));
+    $attributes['token'] = hash('sha1', serialize($placeholder_render_array));
     $placeholder_markup = SafeMarkup::format('<drupal-render-placeholder@attributes></drupal-render-placeholder>', ['@attributes' => $attributes]);
 
     // Build the placeholder element to return.
@@ -707,7 +707,7 @@
     $attributes = new Attribute();
     $attributes['callback'] = $placeholder_render_array['#lazy_builder'][0];
     $attributes['arguments'] = UrlHelper::buildQuery($placeholder_render_array['#lazy_builder'][1]);
-    $attributes['token'] = hash('sha1', serialize($placeholder_render_array));
+    $attributes['token'] = hash('crc32', serialize($placeholder_render_array));
     $placeholder_markup = SafeMarkup::format('<drupal-render-placeholder@attributes></drupal-render-placeholder>', ['@attributes' => $attributes]);
 
     // Build the placeholder element to return.
diff -u b/core/tests/Drupal/Tests/Core/Render/RendererPlaceholdersTest.php b/core/tests/Drupal/Tests/Core/Render/RendererPlaceholdersTest.php
--- b/core/tests/Drupal/Tests/Core/Render/RendererPlaceholdersTest.php
+++ b/core/tests/Drupal/Tests/Core/Render/RendererPlaceholdersTest.php
@@ -61,14 +61,14 @@
       else {
         unset($token_render_array['#cache']);
       }
-      $token = crc32(serialize($token_render_array));
+      $token = hash('sha1', serialize($token_render_array));
       return SafeMarkup::format('<drupal-render-placeholder callback="@callback" arguments="@arguments" token="@token"></drupal-render-placeholder>', [
         '@callback' => 'Drupal\Tests\Core\Render\PlaceholdersTest::callback',
         '@arguments' => '0=' . $args[0],
       if (is_array($cache_keys)) {
         $token_render_array['#cache']['keys'] = $cache_keys;
       }
-      $token = hash('sha1', serialize($token_render_array));
+      $token = hash('crc32', serialize($token_render_array));
       return SafeMarkup::format('<drupal-render-placeholder callback="@callback" arguments="@arguments" token="@token"></drupal-render-placeholder>', [
         '@callback' => 'Drupal\Tests\Core\Render\PlaceholdersTest::callback',
         '@arguments' => '0=' . $args[0],
@@ -275,7 +275,7 @@
       $expected_placeholder_render_array['#cache']['keys'] = $placeholder_cid_keys;
     }
     $expected_placeholder_render_array['#lazy_builder'] = ['Drupal\Tests\Core\Render\PlaceholdersTest::callback', $args];
-    $token = crc32(serialize($expected_placeholder_render_array));
+    $token = hash('sha1', serialize($expected_placeholder_render_array));
     $expected_placeholder_markup = '<drupal-render-placeholder callback="Drupal\Tests\Core\Render\PlaceholdersTest::callback" arguments="0=' . $args[0] . '" token="' . $token . '"></drupal-render-placeholder>';
     $this->assertSame($expected_placeholder_markup, Html::normalize($expected_placeholder_markup), 'Placeholder unaltered by Html::normalize() which is used by FilterHtmlCorrector.');
 
@@ -440,7 +440,7 @@
 
     $this->setUpRequest('GET');
 
-    $token = hash('sha1', serialize($expected_placeholder_render_array));
+    $token = hash('crc32', serialize($expected_placeholder_render_array));
     $expected_placeholder_markup = '<drupal-render-placeholder callback="Drupal\Tests\Core\Render\PlaceholdersTest::callback" arguments="0=' . $args[0] . '" token="' . $token . '"></drupal-render-placeholder>';
     $this->assertSame($expected_placeholder_markup, Html::normalize($expected_placeholder_markup), 'Placeholder unaltered by Html::normalize() which is used by FilterHtmlCorrector.');