diff -u b/core/lib/Drupal/Component/Assertion/Handle.php b/core/lib/Drupal/Component/Assertion/Handle.php
--- b/core/lib/Drupal/Component/Assertion/Handle.php
+++ b/core/lib/Drupal/Component/Assertion/Handle.php
@@ -2,14 +2,14 @@
 
 namespace Drupal\Component\Assertion;
 
-@trigger_error('The ' . __NAMESPACE__ . '\Handle is deprecated in drupal:8.9.0 and is removed from drupal:10.0.0. Instead, use assert_options(ASSERT_EXCEPTION, TRUE). See https://drupal.org/node/3105918', E_USER_DEPRECATED);
+@trigger_error('The ' . __NAMESPACE__ . '\Handle is deprecated in drupal:9.1.0 and is removed from drupal:10.0.0. Instead, use assert_options(ASSERT_EXCEPTION, TRUE). See https://drupal.org/node/3105918', E_USER_DEPRECATED);
 
 /**
  * Handler for runtime assertion failures.
  *
  * @ingroup php_assert
  *
- * @deprecated in drupal:8.9.0 and is removed from drupal:10.0.0.
+ * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0.
  * Use assert_options(ASSERT_EXCEPTION, TRUE).
  *
  * @see https://drupal.org/node/3105918