diff --git a/composer.json b/composer.json
index f549972..cd00411 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
         "php-http/message-factory": "^1.1"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7 || ^8 || ^9.4",
+        "phpunit/phpunit": "^7 || ^8 || ^9.4 || ^10.5",
         "php-http/message": "^1.7",
         "php-http/mock-client": "^1.0",
         "nyholm/psr7": "^1.0"
diff --git a/tests/Tests/CurrencyPairTest.php b/tests/Tests/CurrencyPairTest.php
index 58e5c26..95ee8c1 100644
--- a/tests/Tests/CurrencyPairTest.php
+++ b/tests/Tests/CurrencyPairTest.php
@@ -29,7 +29,7 @@ public function it_creates_a_pair_from_a_valid_string($string, $baseCurrency, $q
         $this->assertEquals($quoteCurrency, $pair->getQuoteCurrency());
     }
 
-    public function validStringProvider()
+    public static function validStringProvider()
     {
         return [
             ['EUR/USD', 'EUR', 'USD'],
@@ -49,7 +49,7 @@ public function it_throws_an_exception_when_creating_from_an_invalid_string($str
         CurrencyPair::createFromString($string);
     }
 
-    public function invalidStringProvider()
+    public static function invalidStringProvider()
     {
         return [
             ['EUR'], ['EUR/'], ['EU/US'], ['EUR/US'], ['US/EUR'], ['00'], ['00/'], ['007/00'],
diff --git a/tests/Tests/Service/ApiLayer/ExchangeRatesDataTest.php b/tests/Tests/Service/ApiLayer/ExchangeRatesDataTest.php
index f0f6030..4501371 100644
--- a/tests/Tests/Service/ApiLayer/ExchangeRatesDataTest.php
+++ b/tests/Tests/Service/ApiLayer/ExchangeRatesDataTest.php
@@ -82,7 +82,7 @@ public function it_throws_An_unsupported_currency_pair_exception(
         $service->getExchangeRate($query);
     }
 
-    public function unsupportedCurrencyPairResponsesProvider(): array
+    public static function unsupportedCurrencyPairResponsesProvider(): array
     {
         $dir = __DIR__.'/../../../Fixtures/Service/ApiLayer/ExchangeRatesData/';
 
diff --git a/tests/Tests/Service/ExchangeRatesApiTest.php b/tests/Tests/Service/ExchangeRatesApiTest.php
index 83fd0a1..b81d03a 100644
--- a/tests/Tests/Service/ExchangeRatesApiTest.php
+++ b/tests/Tests/Service/ExchangeRatesApiTest.php
@@ -91,7 +91,7 @@ public function it_throws_An_unsupported_currency_pair_exception(
         $service->getExchangeRate($query);
     }
 
-    public function unsupportedCurrencyPairResponsesProvider(): array
+    public static function unsupportedCurrencyPairResponsesProvider(): array
     {
         $dir = __DIR__.'/../../Fixtures/Service/ExchangeRatesApi/';
 
diff --git a/tests/Tests/Service/NationalBankOfRomaniaTest.php b/tests/Tests/Service/NationalBankOfRomaniaTest.php
index 31a1a24..8abb1db 100644
--- a/tests/Tests/Service/NationalBankOfRomaniaTest.php
+++ b/tests/Tests/Service/NationalBankOfRomaniaTest.php
@@ -156,7 +156,7 @@ public function it_has_a_name(): void
         $this->assertSame('national_bank_of_romania', $service->getName());
     }
 
-    public function getSupportedCurrencies(): array
+    public static function getSupportedCurrencies(): array
     {
         return [
             ['AED'],