.../serialization/src/Normalizer/TimeStampItemNormalizerTrait.php     | 4 ++--
 core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php        | 1 -
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/core/modules/serialization/src/Normalizer/TimeStampItemNormalizerTrait.php b/core/modules/serialization/src/Normalizer/TimeStampItemNormalizerTrait.php
index 3c00f79..4be2514 100644
--- a/core/modules/serialization/src/Normalizer/TimeStampItemNormalizerTrait.php
+++ b/core/modules/serialization/src/Normalizer/TimeStampItemNormalizerTrait.php
@@ -4,12 +4,12 @@
 
 use Symfony\Component\Serializer\Exception\UnexpectedValueException;
 
-@trigger_error(__NAMESPACE__ . '\TimeStampItemNormalizerTrait is deprecated in Drupal 8.5.0 and will be removed in Drupal 9.0.0. Use \Drupal\serialization\Normalizer\TimestampNormalizer instead.', E_USER_DEPRECATED);
+@trigger_error(__NAMESPACE__ . '\TimeStampItemNormalizerTrait is deprecated in Drupal 8.6.0 and will be removed in Drupal 9.0.0. Use \Drupal\serialization\Normalizer\TimestampNormalizer instead.', E_USER_DEPRECATED);
 
 /**
  * A trait for TimestampItem normalization functionality.
  *
- * @deprecated in 8.5.0, use \Drupal\serialization\Normalizer\TimestampNormalizer instead.
+ * @deprecated in 8.6.0, use \Drupal\serialization\Normalizer\TimestampNormalizer instead.
  */
 trait TimeStampItemNormalizerTrait {
 
diff --git a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
index 76da916..d96193e 100644
--- a/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
+++ b/core/tests/Drupal/Tests/Listeners/DeprecationListenerTrait.php
@@ -189,7 +189,6 @@ public static function getSkippedDeprecations() {
       'Using the Yaml::PARSE_KEYS_AS_STRINGS flag is deprecated since Symfony 3.4 as it will be removed in 4.0. Quote your keys when they are evaluable instead.',
       'Drupal\node\Plugin\Action\DeleteNode is deprecated in Drupal 8.6.x, will be removed before Drupal 9.0.0. Use \Drupal\Core\Action\Plugin\Action\DeleteAction instead. See https://www.drupal.org/node/2934349.',
       'Drupal\comment\Plugin\Action\DeleteComment is deprecated in Drupal 8.6.x, will be removed before Drupal 9.0.0. Use \Drupal\Core\Action\Plugin\Action\DeleteAction instead. See https://www.drupal.org/node/2934349.',
-      'The "serializer.normalizer.datetimeiso8601" service is deprecated and will be removed in Drupal 9.0.0.'
     ];
   }