diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7e8ec2f..bb85a67 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [8.0, 8.1, 8.2]
+        php: [8.0, 8.1, 8.2, 8.3]
         experimental: [false]
         include:
           - php: 8.2
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index ccac1b2..8216eb2 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -1,5 +1,6 @@
 parameters:
   level: max
-  checkMissingIterableValueType: false
+  ignoreErrors:
+    - identifier: missingType.iterableValue
   paths:
     - src
diff --git a/src/Factory/StreamFactory.php b/src/Factory/StreamFactory.php
index 31d99b5..04d22a1 100644
--- a/src/Factory/StreamFactory.php
+++ b/src/Factory/StreamFactory.php
@@ -51,7 +51,7 @@ public function createStream(string $content = ''): StreamInterface
     public function createStreamFromFile(
         string $filename,
         string $mode = 'r',
-        StreamInterface $cache = null
+        ?StreamInterface $cache = null
     ): StreamInterface {
         set_error_handler(
             static function (int $errno, string $errstr) use ($filename, $mode): void {
@@ -82,7 +82,7 @@ static function (int $errno, string $errstr) use ($filename, $mode): void {
     /**
      * {@inheritdoc}
      */
-    public function createStreamFromResource($resource, StreamInterface $cache = null): StreamInterface
+    public function createStreamFromResource($resource, ?StreamInterface $cache = null): StreamInterface
     {
         if (!is_resource($resource)) {
             throw new InvalidArgumentException(
diff --git a/src/Request.php b/src/Request.php
index 252f5a1..4f9e1d9 100644
--- a/src/Request.php
+++ b/src/Request.php
@@ -270,7 +270,6 @@ public function getQueryParams(): array
         // Decode URL data
         parse_str($this->uri->getQuery(), $this->queryParams);
 
-        // @phpstan-ignore-next-line
         return is_array($this->queryParams) ? $this->queryParams : [];
     }
 
diff --git a/src/Stream.php b/src/Stream.php
index fa8e268..25a97f8 100644
--- a/src/Stream.php
+++ b/src/Stream.php
@@ -304,7 +304,7 @@ public function read($length): string
     {
         $data = false;
 
-        if ($this->isReadable() && $this->stream && $length >= 0) {
+        if ($this->isReadable() && $this->stream && $length > 0) {
             $data = fread($this->stream, $length);
         }
 
diff --git a/tests/bootstrap.php b/tests/bootstrap.php
index dbe4a90..eee5637 100644
--- a/tests/bootstrap.php
+++ b/tests/bootstrap.php
@@ -29,7 +29,7 @@
         }
     ],
     Message::class => [
-        'header' => function (string $string, bool $replace = true, int $statusCode = null): void {
+        'header' => function (string $string, bool $replace = true, ?int $statusCode = null): void {
             HeaderStack::push(
                 [
                     'header'      => $string,