diff --git a/CHANGELOG-4.3.md b/CHANGELOG-4.3.md
index 8f905cd7af..29037980b3 100644
--- a/CHANGELOG-4.3.md
+++ b/CHANGELOG-4.3.md
@@ -7,6 +7,46 @@ in 4.3 minor versions.
 To get the diff for a specific change, go to https://github.com/symfony/symfony/commit/XXX where XXX is the change hash
 To get the diff between two versions, go to https://github.com/symfony/symfony/compare/v4.3.0...v4.3.1
 
+* 4.3.1 (2019-06-06)
+
+ * bug #31894 Fix wrong requirements for ocramius/proxy-manager in root composer.json (henrikvolmer)
+ * bug #31865 [Form] Fix wrong DateTime on outdated ICU library (aweelex)
+ * bug #31893 [HttpKernel] fix link to source generation (nicolas-grekas)
+ * bug #31880 [FrameworkBundle] fix BC-breaking property in WebTestAssertionsTrait (nicolas-grekas)
+ * bug #31881 [FramworkBundle][HttpKernel] fix KernelBrowser BC layer (nicolas-grekas)
+ * bug #31879 [Cache] Pass  arg to get callback everywhere (fancyweb)
+ * bug #31874 [Doctrine Bridge] Check field type before adding Length constraint (belinde)
+ * bug #31872 [Messenger] Add missing runtime check for ext redis version (chalasr)
+ * bug #31864 [Cache] Fixed undefined variable in ArrayTrait (eXtreme)
+ * bug #31863 [HttpFoundation] Fixed case-sensitive handling of cache-control header in RedirectResponse constructor (Ivo)
+ * bug #31850 [HttpClient] add $response->cancel() (nicolas-grekas)
+ * bug #31871 [HttpClient] revert bad logic around JSON_THROW_ON_ERROR (nicolas-grekas)
+ * bug #31869 Fix json-encoding when JSON_THROW_ON_ERROR is used (nicolas-grekas)
+ * bug #31868 [HttpKernel] Fix handling non-catchable fatal errors (nicolas-grekas)
+ * bug #31834 [HttpClient] Don't throw InvalidArgumentException on bad Location header (nicolas-grekas)
+ * bug #31846 [Mailer] Set default crypto method (bpolaszek)
+ * bug #31849 [Console] Add check for Konsole/Yakuake to disable hyperlinks (belinde)
+ * bug #31854 Rename the Symfony Mailer service implementation to avoid conflict with SwitMailer (tgalopin)
+ * bug #31856 [VarDumper] fix dumping the cloner itself (nicolas-grekas)
+ * bug #31861 [HttpClient] work around PHP 7.3 bug related to json_encode() (nicolas-grekas)
+ * bug #31860 [HttpFoundation] work around PHP 7.3 bug related to json_encode() (nicolas-grekas)
+ * bug #31852 [Form] add missing symfony/service-contracts dependency (nicolas-grekas)
+ * bug #31836 [DoctrineBridge] do not process private properties from parent class (xabbuh)
+ * bug #31790 [Messenger] set amqp content_type based on serialization format (Tobion)
+ * bug #31832 [HttpClient] fix unregistering the debug buffer when using curl (nicolas-grekas)
+ * bug #31407 [Security] added support for updated "distinguished name" format in x509 authentication (Robert Kopera)
+ * bug #31774 [Mailer] Fix the possibility to set a From header from MessageListener (fabpot)
+ * bug #31811 [DoctrineBridge] don't add embedded properties to wrapping class metadata (xabbuh)
+ * bug #31786 [Translation] Fixed case sensitivity of lint:xliff command (javiereguiluz)
+ * bug #31815 [Translator] Collect locale details earlier in the process (pierredup)
+ * bug #31761 [TwigBridge] suggest Translation Component when TranslationExtension is used (nicolas-grekas)
+ * bug #31748 [Messenger] Inject RoutableMessageBus instead of bus locator (chalasr)
+ * bug #31763 [Security\Core] Make SodiumPasswordEncoder validate BCrypt-ed passwords (nicolas-grekas)
+ * bug #31744 [Validator] Fix TimezoneValidator default option (ro0NL)
+ * bug #31749 [DoctrineBridge][Validator] do not enable validator auto mapping by default (xabbuh)
+ * bug #31757 [DomCrawler] Fix type error with null Form::$currentUri (chalasr)
+ * bug #31721 [PHPUnitBridge] Use a more appropriate group when deprecating mode (greg0ire)
+
 * 4.3.0 (2019-05-30)
 
  * bug #31654 [HttpFoundation] Do not set X-Accel-Redirect for paths outside of X-Accel-Mapping (vilius-g)
diff --git a/UPGRADE-4.2.md b/UPGRADE-4.2.md
index 90cd04d01e..3b1f238fa6 100644
--- a/UPGRADE-4.2.md
+++ b/UPGRADE-4.2.md
@@ -385,7 +385,7 @@ Validator
  * The `symfony/translation` dependency has been removed - run `composer require symfony/translation` if you need the component
  * The `checkMX` and `checkHost` options of the `Email` constraint are deprecated
  * The component is now decoupled from `symfony/translation` and uses `Symfony\Contracts\Translation\TranslatorInterface` instead
- * The `ValidatorBuilderInterface` has been deprecated and `ValidatorBuilder` made final
+ * The `ValidatorBuilderInterface` has been deprecated and `ValidatorBuilder::setTranslator()` has been made final
  * Deprecated validating instances of `\DateTimeInterface` in `DateTimeValidator`, `DateValidator` and `TimeValidator`. Use `Type` instead or remove the constraint if the underlying model is type hinted to `\DateTimeInterface` already.
  * Using the `Bic`, `Country`, `Currency`, `Language` and `Locale` constraints without `symfony/intl` is deprecated
  * Using the `Email` constraint in strict mode without `egulias/email-validator` is deprecated
diff --git a/UPGRADE-5.0.md b/UPGRADE-5.0.md
index 78bcb71f29..b848189513 100644
--- a/UPGRADE-5.0.md
+++ b/UPGRADE-5.0.md
@@ -437,7 +437,7 @@ Validator
  * Calling `EmailValidator::__construct()` method with a boolean parameter has been removed, use `EmailValidator("strict")` instead.
  * Removed the `checkDNS` and `dnsMessage` options from the `Url` constraint.
  * The component is now decoupled from `symfony/translation` and uses `Symfony\Contracts\Translation\TranslatorInterface` instead
- * The `ValidatorBuilderInterface` has been removed and `ValidatorBuilder` is now final
+ * The `ValidatorBuilderInterface` has been removed
  * Removed support for validating instances of `\DateTimeInterface` in `DateTimeValidator`, `DateValidator` and `TimeValidator`. Use `Type` instead or remove the constraint if the underlying model is type hinted to `\DateTimeInterface` already.
  * The `symfony/intl` component is now required for using the `Bic`, `Country`, `Currency`, `Language` and `Locale` constraints
  * The `egulias/email-validator` component is now required for using the `Email` constraint in strict mode
diff --git a/src/Symfony/Component/HttpKernel/HttpKernelBrowser.php b/src/Symfony/Component/HttpKernel/HttpKernelBrowser.php
index ab52df14ed..e413634755 100644
--- a/src/Symfony/Component/HttpKernel/HttpKernelBrowser.php
+++ b/src/Symfony/Component/HttpKernel/HttpKernelBrowser.php
@@ -11,6 +11,9 @@
 
 namespace Symfony\Component\HttpKernel;
 
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+
 /**
  * Client simulates a browser and makes requests to an HttpKernel instance.
  *
diff --git a/src/Symfony/Component/Validator/CHANGELOG.md b/src/Symfony/Component/Validator/CHANGELOG.md
index 3bf22b7211..56ff079f46 100644
--- a/src/Symfony/Component/Validator/CHANGELOG.md
+++ b/src/Symfony/Component/Validator/CHANGELOG.md
@@ -32,7 +32,7 @@ CHANGELOG
  * added `DivisibleBy` constraint
  * decoupled from `symfony/translation` by using `Symfony\Contracts\Translation\TranslatorInterface`
  * deprecated `ValidatorBuilderInterface`
- * made `ValidatorBuilder` final
+ * made `ValidatorBuilder::setTranslator()` final
  * marked `format` the default option in `DateTime` constraint
  * deprecated validating instances of `\DateTimeInterface` in `DateTimeValidator`, `DateValidator` and `TimeValidator`.
  * deprecated using the `Bic`, `Country`, `Currency`, `Language` and `Locale` constraints without `symfony/intl`
diff --git a/src/Symfony/Component/Validator/ValidatorBuilder.php b/src/Symfony/Component/Validator/ValidatorBuilder.php
index 0766a2e9f3..a65cca4c3d 100644
--- a/src/Symfony/Component/Validator/ValidatorBuilder.php
+++ b/src/Symfony/Component/Validator/ValidatorBuilder.php
@@ -38,8 +38,6 @@ use Symfony\Contracts\Translation\TranslatorTrait;
  * The default implementation of {@link ValidatorBuilderInterface}.
  *
  * @author Bernhard Schussek <bschussek@gmail.com>
- *
- * @final since Symfony 4.2
  */
 class ValidatorBuilder implements ValidatorBuilderInterface
 {
@@ -255,6 +253,8 @@ class ValidatorBuilder implements ValidatorBuilderInterface
 
     /**
      * {@inheritdoc}
+     *
+     * @final since Symfony 4.2
      */
     public function setTranslator(LegacyTranslatorInterface $translator)
     {