.../serialization/src/Normalizer/TimeStampItemNormalizerTrait.php     | 4 ++--
 .../tests/src/Unit/Normalizer/DateTimeIso8601NormalizerTest.php       | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/core/modules/serialization/src/Normalizer/TimeStampItemNormalizerTrait.php b/core/modules/serialization/src/Normalizer/TimeStampItemNormalizerTrait.php
index 4be2514..5029671 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 8.6.0 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 8.7.0 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 8.6.0, use \Drupal\serialization\Normalizer\TimestampNormalizer instead.
+ * @deprecated in 8.7.0, use \Drupal\serialization\Normalizer\TimestampNormalizer instead.
  */
 trait TimeStampItemNormalizerTrait {
 
diff --git a/core/modules/serialization/tests/src/Unit/Normalizer/DateTimeIso8601NormalizerTest.php b/core/modules/serialization/tests/src/Unit/Normalizer/DateTimeIso8601NormalizerTest.php
index 9a63d3d..c630deb 100644
--- a/core/modules/serialization/tests/src/Unit/Normalizer/DateTimeIso8601NormalizerTest.php
+++ b/core/modules/serialization/tests/src/Unit/Normalizer/DateTimeIso8601NormalizerTest.php
@@ -172,7 +172,7 @@ public function testDenormalizeValidFormats($normalized, $expected) {
    */
   public function providerTestDenormalizeValidFormats() {
     $data = [];
-    $data["denormalized dates have the UTC timezone"] = ['2016-11-06', new \DateTimeImmutable('2016-11-06T12:00:00', new \DateTimeZone('UTC'))];
+    $data['denormalized dates have the UTC timezone'] = ['2016-11-06', new \DateTimeImmutable('2016-11-06T12:00:00', new \DateTimeZone('UTC'))];
     return $data;
   }