diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 0da09ce..b87015a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -21,7 +21,7 @@ jobs: # Docs: <https://git.io/JvxXE>
         setup: [basic, lowest]
         laravel: [default]
         coverage: [yes]
-        php: ['8.2', '8.3']
+        php: ['8.2', '8.3', '8.4']
         include:
           - php: '8.2'
             setup: [ basic, lowest ]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc1b295..c97335f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,17 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## Unreleased
+
+### Changed
+
+- Minimal `guzzlehttp/guzzle` version now is `7,10`
+- Minimal `phpstan/phpstan` version now is `1.12.27`
+
+### Fixed
+
+- Deprecated implicit marking of parameter as nullable
+
 ## v2.8.0
 
 ### Added
diff --git a/composer.json b/composer.json
index cf52b70..701f0ac 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "php": "^8.2",
         "ext-json": "*",
         "ext-mbstring": "*",
-        "guzzlehttp/guzzle": "^7.7",
+        "guzzlehttp/guzzle": "^7.10",
         "illuminate/contracts": "~10.0 || ~11.0 || ~12.0",
         "illuminate/support": "~10.0 || ~11.0 || ~12.0",
         "illuminate/config": "~10.0 || ~11.0 || ~12.0",
@@ -26,7 +26,7 @@
     },
     "require-dev": {
         "laravel/laravel": "~10.0 || ~11.0 || ~12.0",
-        "phpstan/phpstan": "^1.10",
+        "phpstan/phpstan": "^1.12.27",
         "phpunit/phpunit": "^10.5"
     },
     "autoload": {
diff --git a/src/Client.php b/src/Client.php
index 0e31798..bb90851 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -57,7 +57,7 @@ public static function version(bool $without_hash = true): string
     /**
      * {@inheritdoc}
      */
-    public function healthcheck(string $node_name = null): bool
+    public function healthcheck(?string $node_name = null): bool
     {
         $url = '/api/healthchecks/node' . ($node_name === null
                 ? ''
diff --git a/src/ClientInterface.php b/src/ClientInterface.php
index fb1655d..e0a98b0 100644
--- a/src/ClientInterface.php
+++ b/src/ClientInterface.php
@@ -27,7 +27,7 @@ public static function version(bool $without_hash = true): string;
      *
      * @return bool
      */
-    public function healthcheck(string $node_name = null): bool;
+    public function healthcheck(?string $node_name = null): bool;
 
     /**
      * Get queue info by name (and vhost).
diff --git a/src/ConnectionSettings.php b/src/ConnectionSettings.php
index ed39bed..f3ce106 100644
--- a/src/ConnectionSettings.php
+++ b/src/ConnectionSettings.php
@@ -44,7 +44,7 @@ public function __construct(string $entry_point,
                                 string $login = 'guest',
                                 string $password = 'guest',
                                 int $timeout = 5,
-                                string $user_agent = null)
+                                ?string $user_agent = null)
     {
         $this->entry_point = \rtrim($entry_point, ' \\/');
         $this->login       = $login;
diff --git a/src/Frameworks/Illuminate/ClientFactory.php b/src/Frameworks/Illuminate/ClientFactory.php
index 84064c3..a4de5ad 100644
--- a/src/Frameworks/Illuminate/ClientFactory.php
+++ b/src/Frameworks/Illuminate/ClientFactory.php
@@ -56,7 +56,7 @@ public function defaultConnectionName(): string
     /**
      * {@inheritdoc}
      */
-    public function make(string $connection_name = null, array $options = null): ClientInterface
+    public function make(?string $connection_name = null, ?array $options = null): ClientInterface
     {
         $connection_name = $connection_name ?? $this->defaultConnectionName();
 
diff --git a/src/Frameworks/Illuminate/ClientFactoryInterface.php b/src/Frameworks/Illuminate/ClientFactoryInterface.php
index 9455223..205b1ca 100644
--- a/src/Frameworks/Illuminate/ClientFactoryInterface.php
+++ b/src/Frameworks/Illuminate/ClientFactoryInterface.php
@@ -31,5 +31,5 @@ public function defaultConnectionName(): string;
      *
      * @return ClientInterface
      */
-    public function make(string $connection_name = null, array $options = null): ClientInterface;
+    public function make(?string $connection_name = null, ?array $options = null): ClientInterface;
 }