diff --git a/composer.json b/composer.json
index 137e453..958300d 100644
--- a/composer.json
+++ b/composer.json
@@ -13,12 +13,12 @@
     ],
     "require": {
         "php": "^7.4|^8.0",
-        "symfony/finder": "^4|^5|^6|^7",
+        "symfony/finder": "^4|^5|^6|^7|^8",
         "ext-json": "*"
     },
     "require-dev": {
-        "phpunit/phpunit": "^9|^10",
-        "symfony/var-dumper": "^4|^5|^6|^7"
+        "phpunit/phpunit": "^9|^10|^11|^12|^13",
+        "symfony/var-dumper": "^4|^5|^6|^7|^8"
     },
     "autoload": {
         "psr-4": {
diff --git a/src/CnbRates.php b/src/CnbRates.php
index c247935..7c5c938 100644
--- a/src/CnbRates.php
+++ b/src/CnbRates.php
@@ -39,7 +39,7 @@ public function __construct(?string $cacheDir = null)
         $this->cacheDir = $cacheDir.'/defr';
     }
 
-    public function getRates(DateTime $date = null): Rates
+    public function getRates(?DateTime $date = null): Rates
     {
         if (null === $date) {
             $date = new DateTime();
diff --git a/src/NameDaysAbstract.php b/src/NameDaysAbstract.php
index 177492c..cbb1678 100644
--- a/src/NameDaysAbstract.php
+++ b/src/NameDaysAbstract.php
@@ -28,7 +28,7 @@ abstract class NameDaysAbstract
      *
      * @return string
      */
-    public static function getNameDay(\DateTime $date = null)
+    public static function getNameDay(?\DateTime $date = null)
     {
         if (!$date) {
             $date = new \DateTime();