diff --git a/composer.json b/composer.json
index bcacd39..42f19f3 100644
--- a/composer.json
+++ b/composer.json
@@ -10,10 +10,10 @@
         }
     ],
     "require": {
-        "php": ">= 5.6"
+        "php": ">= 7.2"
     },
     "require-dev": {
-        "nette/nette": "~2.4",
+        "nette/nette": "~3.0",
         "phpunit/phpunit": "^5.3",
         "squizlabs/php_codesniffer": "^2.6"
     },
diff --git a/src/Response/BaseApiResponse.php b/src/Response/BaseApiResponse.php
index 7adeef6..3a52606 100644
--- a/src/Response/BaseApiResponse.php
+++ b/src/Response/BaseApiResponse.php
@@ -86,7 +86,7 @@ public function getCharset()
      * @param IRequest $httpRequest
      * @param IResponse $httpResponse
      */
-    public function send(IRequest $httpRequest, IResponse $httpResponse)
+    public function send(IRequest $httpRequest, IResponse $httpResponse): void
     {
         $httpResponse->setCode($this->getCode());
         $httpResponse->setContentType($this->getContentType(), $this->charset);