diff --git a/.scrutinizer.yml b/.scrutinizer.yml
index d754df69..a01d1bd5 100644
--- a/.scrutinizer.yml
+++ b/.scrutinizer.yml
@@ -6,7 +6,7 @@ build:
         rabbitmq: false
         mongodb: false
         php:
-            version: 7.3
+            version: 7.4
 
     cache:
         disabled: false
diff --git a/.travis.yml b/.travis.yml
index 29fa0279..efc25fb7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -3,8 +3,7 @@ sudo: false
 language: php
 
 php:
-  - 7.3
-  - 7.4snapshot
+  - 7.4
   - nightly
 
 cache:
diff --git a/README.md b/README.md
index 06f4706a..77b13be9 100644
--- a/README.md
+++ b/README.md
@@ -75,11 +75,9 @@ use Zend\Diactoros\StreamFactory;
 $middleware = ContentTypeMiddleware::fromRecommendedSettings(
     // First argument is the list of formats you want to support:
     [
-        'json' => [
-            'extension' => ['json'],
-            'mime-type' => ['application/json', 'text/json', 'application/x-json'],
-            'charset' => true,
-        ],
+        'json',
+        // You may also specify the full configuration of the format.
+        // That's handy if you need to add extensions or mime-types:
         'html' => [
             'extension' => ['html', 'htm', 'php'],
             'mime-type' => ['text/html', 'application/xhtml+xml'],
diff --git a/composer.json b/composer.json
index ac991aff..b7ac8699 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         }
     },
     "require": {
-        "php": "^7.3",
+        "php": "^7.4 || ^8.0",
         "ext-json": "*",
         "fig/http-message-util": "^1.1",
         "psr/http-factory": "^1.0",
@@ -28,24 +28,25 @@
     "require-dev": {
         "infection/infection": "^0.15",
         "jms/serializer": "^3.5",
-        "lcobucci/coding-standard": "^3.1",
+        "laminas/laminas-diactoros": "^2.2",
+        "lcobucci/coding-standard": "^4.0",
         "league/plates": "^3.3",
-        "middlewares/negotiation": "^1.1",
-        "phpstan/phpstan": "^0.11",
-        "phpstan/phpstan-deprecation-rules": "^0.11",
-        "phpstan/phpstan-phpunit": "^0.11",
-        "phpstan/phpstan-strict-rules": "^0.11",
+        "middlewares/negotiation": "^2.0",
+        "phpstan/extension-installer": "^1.0",
+        "phpstan/phpstan": "^0.12",
+        "phpstan/phpstan-deprecation-rules": "^0.12",
+        "phpstan/phpstan-phpunit": "^0.12",
+        "phpstan/phpstan-strict-rules": "^0.12",
         "phpunit/phpunit": "^9.0",
         "squizlabs/php_codesniffer": "^3.5",
-        "twig/twig": "^2.12",
-        "zendframework/zend-diactoros": "^2.2"
+        "twig/twig": "^3.0"
     },
     "suggest": {
         "jms/serializer": "For content formatting using a more flexible serializer",
         "league/plates": "For content formatting using Plates as template engine",
         "middlewares/negotiation": "For acceptable format identification",
         "twig/twig": "For content formatting using Twig as template engine",
-        "zendframework/zend-diactoros": "For concrete implementation of PSR-7"
+        "laminas/laminas-diactoros": "For concrete implementation of PSR-7"
     },
     "autoload": {
         "psr-4": {
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index 79a3306a..5995289c 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -1,9 +1,3 @@
-includes:
-    - vendor/phpstan/phpstan-phpunit/extension.neon
-    - vendor/phpstan/phpstan-phpunit/rules.neon
-    - vendor/phpstan/phpstan-deprecation-rules/rules.neon
-    - vendor/phpstan/phpstan-strict-rules/rules.neon
-
 parameters:
     level: 7
     paths:
@@ -13,3 +7,5 @@ parameters:
         -
             message: '#Variable method call on#'
             path: tests/UnformattedResponseTest.php
+
+        - '#static\(Lcobucci\\ContentNegotiation\\UnformattedResponse\) but returns Lcobucci\\ContentNegotiation\\UnformattedResponse#'
diff --git a/src/ContentTypeMiddleware.php b/src/ContentTypeMiddleware.php
index e45a97b6..e4da09d5 100644
--- a/src/ContentTypeMiddleware.php
+++ b/src/ContentTypeMiddleware.php
@@ -15,20 +15,13 @@
 
 final class ContentTypeMiddleware implements MiddlewareInterface
 {
-    /**
-     * @var MiddlewareInterface
-     */
-    private $negotiator;
-
-    /**
-     * @var StreamFactoryInterface
-     */
-    private $streamFactory;
+    private MiddlewareInterface $negotiator;
+    private StreamFactoryInterface $streamFactory;
 
     /**
      * @var Formatter[]
      */
-    private $formatters;
+    private array $formatters;
 
     /**
      * @param Formatter[] $formatters
diff --git a/src/Formatter/JmsSerializer.php b/src/Formatter/JmsSerializer.php
index cded0b66..d414d16d 100644
--- a/src/Formatter/JmsSerializer.php
+++ b/src/Formatter/JmsSerializer.php
@@ -11,15 +11,8 @@
 
 final class JmsSerializer implements Formatter
 {
-    /**
-     * @var SerializerInterface
-     */
-    private $serializer;
-
-    /**
-     * @var string
-     */
-    private $format;
+    private SerializerInterface $serializer;
+    private string $format;
 
     public function __construct(SerializerInterface $serializer, string $format)
     {
diff --git a/src/Formatter/Json.php b/src/Formatter/Json.php
index 0cb78bc7..e8887bcc 100644
--- a/src/Formatter/Json.php
+++ b/src/Formatter/Json.php
@@ -6,25 +6,20 @@
 use Lcobucci\ContentNegotiation\ContentCouldNotBeFormatted;
 use Lcobucci\ContentNegotiation\Formatter;
 use Throwable;
+use function json_encode;
+use function sprintf;
 use const JSON_HEX_AMP;
 use const JSON_HEX_APOS;
 use const JSON_HEX_QUOT;
 use const JSON_HEX_TAG;
 use const JSON_THROW_ON_ERROR;
 use const JSON_UNESCAPED_SLASHES;
-use function assert;
-use function is_string;
-use function json_encode;
-use function sprintf;
 
 final class Json implements Formatter
 {
     private const DEFAULT_FLAGS = JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_AMP | JSON_HEX_QUOT | JSON_UNESCAPED_SLASHES;
 
-    /**
-     * @var int
-     */
-    private $flags;
+    private int $flags;
 
     public function __construct(int $flags = self::DEFAULT_FLAGS)
     {
@@ -37,10 +32,7 @@ public function __construct(int $flags = self::DEFAULT_FLAGS)
     public function format($content, array $attributes = []): string
     {
         try {
-            $content = json_encode($content, $this->flags | JSON_THROW_ON_ERROR);
-            assert(is_string($content));
-
-            return $content;
+            return json_encode($content, $this->flags | JSON_THROW_ON_ERROR);
         } catch (Throwable $exception) {
             throw new ContentCouldNotBeFormatted(
                 sprintf('An exception was thrown during JSON formatting: %s', $exception->getMessage()),
diff --git a/src/Formatter/Plates.php b/src/Formatter/Plates.php
index b2ad8f12..80a14d76 100644
--- a/src/Formatter/Plates.php
+++ b/src/Formatter/Plates.php
@@ -12,15 +12,8 @@ final class Plates implements Formatter
 {
     private const DEFAULT_ATTRIBUTE = 'template';
 
-    /**
-     * @var Engine
-     */
-    private $engine;
-
-    /**
-     * @var string
-     */
-    private $attributeName;
+    private Engine $engine;
+    private string $attributeName;
 
     public function __construct(Engine $engine, string $attributeName = self::DEFAULT_ATTRIBUTE)
     {
diff --git a/src/Formatter/Twig.php b/src/Formatter/Twig.php
index fb0a21d2..4018b15c 100644
--- a/src/Formatter/Twig.php
+++ b/src/Formatter/Twig.php
@@ -6,24 +6,17 @@
 use Lcobucci\ContentNegotiation\ContentCouldNotBeFormatted;
 use Lcobucci\ContentNegotiation\Formatter;
 use Throwable;
-use Twig_Environment;
+use Twig\Environment;
 
 final class Twig implements Formatter
 {
     private const DEFAULT_ATTRIBUTE = 'template';
 
-    /**
-     * @var Twig_Environment
-     */
-    private $environment;
-
-    /**
-     * @var string
-     */
-    private $attributeName;
+    private Environment $environment;
+    private string $attributeName;
 
     public function __construct(
-        Twig_Environment $environment,
+        Environment $environment,
         string $attributeName = self::DEFAULT_ATTRIBUTE
     ) {
         $this->environment   = $environment;
diff --git a/src/UnformattedResponse.php b/src/UnformattedResponse.php
index 153da3d9..7b4b1b2b 100644
--- a/src/UnformattedResponse.php
+++ b/src/UnformattedResponse.php
@@ -8,10 +8,7 @@
 
 final class UnformattedResponse implements ResponseInterface
 {
-    /**
-     * @var ResponseInterface
-     */
-    private $decoratedResponse;
+    private ResponseInterface $decoratedResponse;
 
     /**
      * @var mixed
@@ -19,13 +16,13 @@ final class UnformattedResponse implements ResponseInterface
     private $unformattedContent;
 
     /**
-     * @var mixed[]
+     * @var array<string, mixed>
      */
-    private $attributes;
+    private array $attributes;
 
     /**
-     * @param mixed   $unformattedContent
-     * @param mixed[] $attributes
+     * @param mixed                $unformattedContent
+     * @param array<string, mixed> $attributes
      */
     public function __construct(
         ResponseInterface $decoratedResponse,
@@ -45,10 +42,7 @@ public function getUnformattedContent()
         return $this->unformattedContent;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getProtocolVersion()
+    public function getProtocolVersion(): string
     {
         return $this->decoratedResponse->getProtocolVersion();
     }
@@ -68,7 +62,7 @@ public function withProtocolVersion($version)
     /**
      * {@inheritdoc}
      */
-    public function getHeaders()
+    public function getHeaders(): array
     {
         return $this->decoratedResponse->getHeaders();
     }
@@ -76,7 +70,7 @@ public function getHeaders()
     /**
      * {@inheritdoc}
      */
-    public function hasHeader($name)
+    public function hasHeader($name): bool
     {
         return $this->decoratedResponse->hasHeader($name);
     }
@@ -92,7 +86,7 @@ public function getHeader($name)
     /**
      * {@inheritdoc}
      */
-    public function getHeaderLine($name)
+    public function getHeaderLine($name): string
     {
         return $this->decoratedResponse->getHeaderLine($name);
     }
@@ -133,10 +127,7 @@ public function withoutHeader($name)
         );
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getBody()
+    public function getBody(): StreamInterface
     {
         return $this->decoratedResponse->getBody();
     }
@@ -153,10 +144,7 @@ public function withBody(StreamInterface $body)
         );
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getStatusCode()
+    public function getStatusCode(): int
     {
         return $this->decoratedResponse->getStatusCode();
     }
@@ -173,10 +161,7 @@ public function withStatus($code, $reasonPhrase = '')
         );
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getReasonPhrase()
+    public function getReasonPhrase(): string
     {
         return $this->decoratedResponse->getReasonPhrase();
     }
@@ -198,7 +183,7 @@ public function withAttribute(string $name, $value): self
     /**
      * Retrieve the configured attributes
      *
-     * @return mixed[]
+     * @return array<string, mixed>
      */
     public function getAttributes(): array
     {
diff --git a/tests/ContentTypeMiddlewareTest.php b/tests/ContentTypeMiddlewareTest.php
index 5e2dce78..bdf1c9ed 100644
--- a/tests/ContentTypeMiddlewareTest.php
+++ b/tests/ContentTypeMiddlewareTest.php
@@ -4,6 +4,10 @@
 namespace Lcobucci\ContentNegotiation\Tests;
 
 use Fig\Http\Message\StatusCodeInterface;
+use Laminas\Diactoros\Response;
+use Laminas\Diactoros\Response\EmptyResponse;
+use Laminas\Diactoros\ServerRequest;
+use Laminas\Diactoros\StreamFactory;
 use Lcobucci\ContentNegotiation\ContentTypeMiddleware;
 use Lcobucci\ContentNegotiation\Formatter;
 use Lcobucci\ContentNegotiation\Tests\Formatter\NaiveTemplateEngine;
@@ -12,10 +16,6 @@
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
-use Zend\Diactoros\Response;
-use Zend\Diactoros\Response\EmptyResponse;
-use Zend\Diactoros\ServerRequest;
-use Zend\Diactoros\StreamFactory;
 use function array_map;
 
 /**
@@ -184,19 +184,13 @@ private function createRequestHandler(ResponseInterface $response): RequestHandl
     {
         return new class($response) implements RequestHandlerInterface
         {
-            /**
-             * @var ResponseInterface
-             */
-            private $response;
+            private ResponseInterface $response;
 
             public function __construct(ResponseInterface $response)
             {
                 $this->response = $response;
             }
 
-            /**
-             * {@inheritdoc}
-             */
             public function handle(ServerRequestInterface $request): ResponseInterface
             {
                 return $this->response;
diff --git a/tests/Formatter/JmsSerializerTest.php b/tests/Formatter/JmsSerializerTest.php
index 6f0779e4..d3f269f1 100644
--- a/tests/Formatter/JmsSerializerTest.php
+++ b/tests/Formatter/JmsSerializerTest.php
@@ -18,7 +18,7 @@ final class JmsSerializerTest extends TestCase
     /**
      * @var SerializerInterface|MockObject
      */
-    private $serializer;
+    private SerializerInterface $serializer;
 
     /**
      * @before
diff --git a/tests/Formatter/JsonTest.php b/tests/Formatter/JsonTest.php
index a7612564..ee845895 100644
--- a/tests/Formatter/JsonTest.php
+++ b/tests/Formatter/JsonTest.php
@@ -9,8 +9,8 @@
 use Lcobucci\ContentNegotiation\Tests\PersonDto;
 use PHPUnit\Framework\TestCase;
 use RuntimeException;
-use const JSON_UNESCAPED_SLASHES;
 use function acos;
+use const JSON_UNESCAPED_SLASHES;
 
 /**
  * @coversDefaultClass \Lcobucci\ContentNegotiation\Formatter\Json
diff --git a/tests/Formatter/PlatesTest.php b/tests/Formatter/PlatesTest.php
index 93c436c3..ccbd0e04 100644
--- a/tests/Formatter/PlatesTest.php
+++ b/tests/Formatter/PlatesTest.php
@@ -15,10 +15,7 @@
  */
 final class PlatesTest extends TestCase
 {
-    /**
-     * @var Engine
-     */
-    private $engine;
+    private Engine $engine;
 
     /**
      * @before
diff --git a/tests/Formatter/TwigTest.php b/tests/Formatter/TwigTest.php
index 38e7cd35..337dc3a8 100644
--- a/tests/Formatter/TwigTest.php
+++ b/tests/Formatter/TwigTest.php
@@ -7,8 +7,8 @@
 use Lcobucci\ContentNegotiation\Formatter\Twig;
 use Lcobucci\ContentNegotiation\Tests\PersonDto;
 use PHPUnit\Framework\TestCase;
-use Twig_Environment;
-use Twig_Loader_Filesystem;
+use Twig\Environment;
+use Twig\Loader\FilesystemLoader;
 use function dirname;
 
 /**
@@ -16,18 +16,15 @@
  */
 final class TwigTest extends TestCase
 {
-    /**
-     * @var Twig_Environment
-     */
-    private $environment;
+    private Environment $environment;
 
     /**
      * @before
      */
     public function configureEngine(): void
     {
-        $this->environment = new Twig_Environment(
-            new Twig_Loader_Filesystem('templates/twig', dirname(__DIR__, 2) . '/')
+        $this->environment = new Environment(
+            new FilesystemLoader('templates/twig', dirname(__DIR__, 2) . '/')
         );
     }
 
diff --git a/tests/PersonDto.php b/tests/PersonDto.php
index f5524cec..9a3c2b96 100644
--- a/tests/PersonDto.php
+++ b/tests/PersonDto.php
@@ -5,15 +5,9 @@
 
 final class PersonDto
 {
-    /**
-     * @var int
-     */
-    public $id;
+    public int $id;
 
-    /**
-     * @var string
-     */
-    public $name;
+    public string $name;
 
     public function __construct(int $id, string $name)
     {
diff --git a/tests/UnformattedResponseTest.php b/tests/UnformattedResponseTest.php
index ea24ca9f..7d196477 100644
--- a/tests/UnformattedResponseTest.php
+++ b/tests/UnformattedResponseTest.php
@@ -3,10 +3,10 @@
 
 namespace Lcobucci\ContentNegotiation\Tests;
 
+use Laminas\Diactoros\Response;
+use Laminas\Diactoros\Stream;
 use Lcobucci\ContentNegotiation\UnformattedResponse;
-use PHPStan\Testing\TestCase;
-use Zend\Diactoros\Response;
-use Zend\Diactoros\Stream;
+use PHPUnit\Framework\TestCase;
 
 /**
  * @coversDefaultClass \Lcobucci\ContentNegotiation\UnformattedResponse