diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf14ebf..38df906 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,12 @@
 # Change Log
 
+## 1.19.3 - 2024-03-28
+
+- [#261](https://github.com/php-http/discovery/pull/261) - explicitly mark nullable parameters as nullable (avoid deprecation in PHP 8.4)
+
 ## 1.19.2 - 2023-11-30
 
-- [#253](https://github.com/php-http/discovery/pull/253) - Symfony 7 dropped the deprecated PHP-HTTP `HttpClient` interface from their HTTP client, do not discover the version 7 client when lookig for the old interface.
+- [#253](https://github.com/php-http/discovery/pull/253) - Symfony 7 dropped the deprecated PHP-HTTP `HttpClient` interface from their HTTP client, do not discover the version 7 client when looking for the old interface.
 
 ## 1.19.1 - 2023-07-11
 
diff --git a/composer.json b/composer.json
index 0d9194c..bd39db8 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
         "php-http/httplug": "^1.0 || ^2.0",
         "php-http/message-factory": "^1.0",
         "phpspec/phpspec": "^5.1 || ^6.1 || ^7.3",
-        "symfony/phpunit-bridge": "^6.2"
+        "symfony/phpunit-bridge": "^6.4.4 || ^7.0.1"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/NotFoundException.php b/src/NotFoundException.php
index d59dadb..559afac 100644
--- a/src/NotFoundException.php
+++ b/src/NotFoundException.php
@@ -2,6 +2,8 @@
 
 namespace Http\Discovery;
 
+use Http\Discovery\Exception\NotFoundException as RealNotFoundException;
+
 /**
  * Thrown when a discovery does not find any matches.
  *
@@ -9,6 +11,6 @@
  *
  * @deprecated since since version 1.0, and will be removed in 2.0. Use {@link \Http\Discovery\Exception\NotFoundException} instead.
  */
-final class NotFoundException extends \Http\Discovery\Exception\NotFoundException
+final class NotFoundException extends RealNotFoundException
 {
 }
diff --git a/src/Psr17FactoryDiscovery.php b/src/Psr17FactoryDiscovery.php
index a73c641..e4348b4 100644
--- a/src/Psr17FactoryDiscovery.php
+++ b/src/Psr17FactoryDiscovery.php
@@ -3,6 +3,7 @@
 namespace Http\Discovery;
 
 use Http\Discovery\Exception\DiscoveryFailedException;
+use Http\Discovery\Exception\NotFoundException as RealNotFoundException;
 use Psr\Http\Message\RequestFactoryInterface;
 use Psr\Http\Message\ResponseFactoryInterface;
 use Psr\Http\Message\ServerRequestFactoryInterface;
@@ -19,7 +20,7 @@ final class Psr17FactoryDiscovery extends ClassDiscovery
 {
     private static function createException($type, Exception $e)
     {
-        return new \Http\Discovery\Exception\NotFoundException(
+        return new RealNotFoundException(
             'No PSR-17 '.$type.' found. Install a package from this list: https://packagist.org/providers/psr/http-factory-implementation',
             0,
             $e
@@ -29,7 +30,7 @@ private static function createException($type, Exception $e)
     /**
      * @return RequestFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function findRequestFactory()
     {
@@ -45,7 +46,7 @@ public static function findRequestFactory()
     /**
      * @return ResponseFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function findResponseFactory()
     {
@@ -61,7 +62,7 @@ public static function findResponseFactory()
     /**
      * @return ServerRequestFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function findServerRequestFactory()
     {
@@ -77,7 +78,7 @@ public static function findServerRequestFactory()
     /**
      * @return StreamFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function findStreamFactory()
     {
@@ -93,7 +94,7 @@ public static function findStreamFactory()
     /**
      * @return UploadedFileFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function findUploadedFileFactory()
     {
@@ -109,7 +110,7 @@ public static function findUploadedFileFactory()
     /**
      * @return UriFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function findUriFactory()
     {
@@ -125,7 +126,7 @@ public static function findUriFactory()
     /**
      * @return UriFactoryInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      *
      * @deprecated This will be removed in 2.0. Consider using the findUriFactory() method.
      */
diff --git a/src/Psr18ClientDiscovery.php b/src/Psr18ClientDiscovery.php
index dfd2dd1..3f95418 100644
--- a/src/Psr18ClientDiscovery.php
+++ b/src/Psr18ClientDiscovery.php
@@ -3,6 +3,7 @@
 namespace Http\Discovery;
 
 use Http\Discovery\Exception\DiscoveryFailedException;
+use Http\Discovery\Exception\NotFoundException as RealNotFoundException;
 use Psr\Http\Client\ClientInterface;
 
 /**
@@ -17,14 +18,14 @@ final class Psr18ClientDiscovery extends ClassDiscovery
      *
      * @return ClientInterface
      *
-     * @throws Exception\NotFoundException
+     * @throws RealNotFoundException
      */
     public static function find()
     {
         try {
             $client = static::findOneByType(ClientInterface::class);
         } catch (DiscoveryFailedException $e) {
-            throw new \Http\Discovery\Exception\NotFoundException('No PSR-18 clients found. Make sure to install a package providing "psr/http-client-implementation". Example: "php-http/guzzle7-adapter".', 0, $e);
+            throw new RealNotFoundException('No PSR-18 clients found. Make sure to install a package providing "psr/http-client-implementation". Example: "php-http/guzzle7-adapter".', 0, $e);
         }
 
         return static::instantiateClass($client);