diff --git a/composer.json b/composer.json
index 11542e4..68f6b32 100644
--- a/composer.json
+++ b/composer.json
@@ -9,7 +9,7 @@
         }
     ],
     "require": {
-        "php": "^7.2 || ^8.0",
+        "php": "^7.4 || ^8.0",
         "nyholm/psr7": "^1.3",
         "php-http/httplug": "^2.0",
         "psr/http-client": "^1.0",
diff --git a/src/Stream.php b/src/Stream.php
index c2475df..c384863 100644
--- a/src/Stream.php
+++ b/src/Stream.php
@@ -61,10 +61,7 @@ public function __construct(RequestInterface $request, $socket, ?int $size = nul
         $this->request = $request;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function __toString()
+    public function __toString(): string
     {
         try {
             return $this->getContents();
@@ -73,10 +70,7 @@ public function __toString()
         }
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function close()
+    public function close(): void
     {
         if ($this->isDetached || null === $this->socket) {
             throw new StreamException('Stream is detached');
@@ -84,9 +78,6 @@ public function close()
         fclose($this->socket);
     }
 
-    /**
-     * {@inheritdoc}
-     */
     public function detach()
     {
         if ($this->isDetached) {
@@ -104,15 +95,12 @@ public function detach()
      *
      * @return int<0, max>|null
      */
-    public function getSize()
+    public function getSize(): ?int
     {
         return $this->size;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function tell()
+    public function tell(): int
     {
         if ($this->isDetached || null === $this->socket) {
             throw new StreamException('Stream is detached');
@@ -125,10 +113,7 @@ public function tell()
         return $tell;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function eof()
+    public function eof(): bool
     {
         if ($this->isDetached || null === $this->socket) {
             throw new StreamException('Stream is detached');
@@ -137,54 +122,32 @@ public function eof()
         return feof($this->socket);
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isSeekable()
+    public function isSeekable(): bool
     {
         return false;
     }
 
-    /**
-     * {@inheritdoc}
-     *
-     * @return void
-     */
-    public function seek($offset, $whence = SEEK_SET)
+    public function seek($offset, $whence = SEEK_SET): void
     {
         throw new StreamException('This stream is not seekable');
     }
 
-    /**
-     * {@inheritdoc}
-     *
-     * @return void
-     */
-    public function rewind()
+    public function rewind(): void
     {
         throw new StreamException('This stream is not seekable');
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isWritable()
+    public function isWritable(): bool
     {
         return false;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function write($string)
+    public function write($string): int
     {
         throw new StreamException('This stream is not writable');
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function isReadable()
+    public function isReadable(): bool
     {
         return true;
     }
@@ -194,7 +157,7 @@ public function isReadable()
      *
      * @param int<0, max> $length
      */
-    public function read($length)
+    public function read($length): string
     {
         if ($this->isDetached || null === $this->socket) {
             throw new StreamException('Stream is detached');
@@ -232,10 +195,7 @@ public function read($length)
         return $read;
     }
 
-    /**
-     * {@inheritdoc}
-     */
-    public function getContents()
+    public function getContents(): string
     {
         if ($this->isDetached || null === $this->socket) {
             throw new StreamException('Stream is detached');
@@ -261,9 +221,6 @@ public function getContents()
         return $contents;
     }
 
-    /**
-     * {@inheritdoc}
-     */
     public function getMetadata($key = null)
     {
         if ($this->isDetached || null === $this->socket) {