diff --git a/tests/Calculator/LocaleAwareBcMathCalculatorTest.php b/tests/Calculator/LocaleAwareBcMathCalculatorTest.php
index a31d4641..d0a57090 100644
--- a/tests/Calculator/LocaleAwareBcMathCalculatorTest.php
+++ b/tests/Calculator/LocaleAwareBcMathCalculatorTest.php
@@ -4,6 +4,8 @@
 
 namespace Tests\Money\Calculator;
 
+use function setlocale;
+
 use const LC_ALL;
 
 /** @covers \Money\Calculator\BcMathCalculator */
@@ -13,6 +15,6 @@ public function setUp(): void
     {
         parent::setUp();
 
-        $this->setLocale(LC_ALL, 'ru_RU.UTF-8');
+        setlocale(LC_ALL, 'ru_RU.UTF-8');
     }
 }
diff --git a/tests/Calculator/LocaleAwareGmpCalculatorTest.php b/tests/Calculator/LocaleAwareGmpCalculatorTest.php
index 19fff94d..aca32ab9 100644
--- a/tests/Calculator/LocaleAwareGmpCalculatorTest.php
+++ b/tests/Calculator/LocaleAwareGmpCalculatorTest.php
@@ -4,6 +4,8 @@
 
 namespace Tests\Money\Calculator;
 
+use function setlocale;
+
 use const LC_ALL;
 
 /** @covers \Money\Calculator\GmpCalculator */
@@ -13,6 +15,6 @@ public function setUp(): void
     {
         parent::setUp();
 
-        $this->setLocale(LC_ALL, 'ru_RU.UTF-8');
+        setlocale(LC_ALL, 'ru_RU.UTF-8');
     }
 }
diff --git a/tests/ConverterTest.php b/tests/ConverterTest.php
index 6dad6ca5..cab4134d 100644
--- a/tests/ConverterTest.php
+++ b/tests/ConverterTest.php
@@ -13,6 +13,7 @@
 use Money\Money;
 use PHPUnit\Framework\TestCase;
 
+use function setlocale;
 use function sprintf;
 
 use const LC_ALL;
@@ -192,7 +193,7 @@ public function itConvertsToADifferentCurrencyWhenDecimalSeparatorIsComma(
         $amount,
         $expectedAmount
     ): void {
-        $this->setLocale(LC_ALL, 'ru_RU.UTF-8');
+        setlocale(LC_ALL, 'ru_RU.UTF-8');
 
         $this->itConvertsToADifferentCurrency(
             $baseCurrencyCode,
diff --git a/tests/MoneyTest.php b/tests/MoneyTest.php
index a6aeff39..a80ad7d8 100644
--- a/tests/MoneyTest.php
+++ b/tests/MoneyTest.php
@@ -10,6 +10,7 @@
 use PHPUnit\Framework\TestCase;
 
 use function json_encode;
+use function setlocale;
 
 use const LC_ALL;
 use const PHP_INT_MAX;
@@ -99,7 +100,7 @@ public function itMultipliesTheAmount(int|string $multiplier, int $roundingMode,
      */
     public function itMultipliesTheAmountWithLocaleThatUsesCommaSeparator(): void
     {
-        $this->setLocale(LC_ALL, 'es_ES.utf8');
+        setlocale(LC_ALL, 'es_ES.utf8');
 
         $money = new Money(100, new Currency(self::CURRENCY));
         $money = $money->multiply('0.1');