diff --git a/composer.json b/composer.json
index 164dd4f..822bedc 100644
--- a/composer.json
+++ b/composer.json
@@ -12,12 +12,12 @@
     ],
     "minimum-stability": "dev",
     "require": {
-        "php": "^7.4 | ^8.0",
+        "php": "^8.0",
         "ext-dom": "*",
         "ext-json": "*",
         "codeception/codeception": "^5.0.0-alpha1",
         "justinrainbow/json-schema": "~5.2.9",
-        "softcreatr/jsonpath": "^0.7 | ^0.8"
+        "softcreatr/jsonpath": "^0.8"
     },
     "require-dev": {
         "ext-libxml": "*",
diff --git a/readme.md b/readme.md
index 84e9168..ceaef61 100644
--- a/readme.md
+++ b/readme.md
@@ -9,7 +9,7 @@ A REST module for Codeception
 
 ## Requirements
 
-* `PHP 7.4` or higher.
+* `PHP 8` or higher.
 
 ## Installation
 
diff --git a/src/Codeception/Util/JsonArray.php b/src/Codeception/Util/JsonArray.php
index 97b783b..f85fa17 100644
--- a/src/Codeception/Util/JsonArray.php
+++ b/src/Codeception/Util/JsonArray.php
@@ -18,12 +18,8 @@ class JsonArray
 
     protected ?DOMDocument $jsonXml = null;
 
-    public function __construct($jsonString)
+    public function __construct(string $jsonString)
     {
-        if (!is_string($jsonString)) {
-            throw new InvalidArgumentException('$jsonString param must be a string.');
-        }
-
         $jsonDecode = json_decode($jsonString, true);
 
         if (!is_array($jsonDecode)) {