diff --git a/src/Http/Response.php b/src/Http/Response.php
index ced15fa6..5a9d7f7e 100644
--- a/src/Http/Response.php
+++ b/src/Http/Response.php
@@ -62,7 +62,7 @@ public function toArray()
      *
      * @return bool
      */
-    public function offsetExists($offset)
+    public function offsetExists($offset): bool
     {
         return isset($this->data->{$offset});
     }
@@ -74,7 +74,7 @@ public function offsetExists($offset)
      *
      * @return mixed
      */
-    public function offsetGet($offset)
+    public function offsetGet($offset): mixed
     {
         $data = $this->toArray();
 
@@ -87,7 +87,7 @@ public function offsetGet($offset)
      * @param mixed $offset
      * @param mixed $value
      */
-    public function offsetSet($offset, $value)
+    public function offsetSet($offset, $value): void
     {
         $this->data->{$offset} = $value;
     }
@@ -97,7 +97,7 @@ public function offsetSet($offset, $value)
      *
      * @param mixed $offset
      */
-    public function offsetUnset($offset)
+    public function offsetUnset($offset): void
     {
         unset($this->data->{$offset});
     }