diff --git a/tests/Collection/CollectionTest.php b/tests/Collection/CollectionTest.php
index 37e9be2..092ef89 100644
--- a/tests/Collection/CollectionTest.php
+++ b/tests/Collection/CollectionTest.php
@@ -491,7 +491,7 @@ class CollectionTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Utilities/ArraysTest.php b/tests/Utilities/ArraysTest.php
index 168fac7..688edce 100644
--- a/tests/Utilities/ArraysTest.php
+++ b/tests/Utilities/ArraysTest.php
@@ -2683,7 +2683,7 @@ letsTest[2] = value_2;';
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -2793,7 +2793,7 @@ letsTest[2] = value_2;';
     /**
      * {@inheritdoc}
      */
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/Utilities/ComposerTest.php b/tests/Utilities/ComposerTest.php
index 10e4177..e8f8117 100644
--- a/tests/Utilities/ComposerTest.php
+++ b/tests/Utilities/ComposerTest.php
@@ -84,7 +84,7 @@ class ComposerTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/Utilities/MiscellaneousTest.php b/tests/Utilities/MiscellaneousTest.php
index 70c36c7..86e7670 100644
--- a/tests/Utilities/MiscellaneousTest.php
+++ b/tests/Utilities/MiscellaneousTest.php
@@ -1470,7 +1470,7 @@ class MiscellaneousTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -1483,7 +1483,7 @@ class MiscellaneousTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
         unset($this->stringSmall, $this->stringCommaSeparated, $this->stringDotSeparated, $this->stringWithoutSpaces);
diff --git a/tests/Utilities/RegexTest.php b/tests/Utilities/RegexTest.php
index c1fb3bc..469bbb0 100644
--- a/tests/Utilities/RegexTest.php
+++ b/tests/Utilities/RegexTest.php
@@ -1998,7 +1998,7 @@ class RegexTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -2010,7 +2010,7 @@ class RegexTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
         unset($this->simpleText, $this->camelCaseText);
diff --git a/tests/Utilities/XmlTest.php b/tests/Utilities/XmlTest.php
index 494aabf..073c320 100644
--- a/tests/Utilities/XmlTest.php
+++ b/tests/Utilities/XmlTest.php
@@ -52,7 +52,7 @@ class XmlTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
@@ -86,7 +86,7 @@ class XmlTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function tearDown()
+    protected function tearDown(): void
     {
         parent::tearDown();
 
diff --git a/tests/ValueObject/AddressTest.php b/tests/ValueObject/AddressTest.php
index 5cd1899..63806e4 100644
--- a/tests/ValueObject/AddressTest.php
+++ b/tests/ValueObject/AddressTest.php
@@ -94,7 +94,7 @@ class AddressTest extends BaseTestCase
         static::assertSame('00111, Saint Louis', (string)$this->addressWithoutStreet);
     }
 
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/ValueObject/BankAccountTest.php b/tests/ValueObject/BankAccountTest.php
index ac38dbc..4b07705 100644
--- a/tests/ValueObject/BankAccountTest.php
+++ b/tests/ValueObject/BankAccountTest.php
@@ -61,7 +61,7 @@ class BankAccountTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();
 
diff --git a/tests/ValueObject/CompanyTest.php b/tests/ValueObject/CompanyTest.php
index 383b012..6fcfd99 100644
--- a/tests/ValueObject/CompanyTest.php
+++ b/tests/ValueObject/CompanyTest.php
@@ -80,7 +80,7 @@ class CompanyTest extends BaseTestCase
     /**
      * {@inheritdoc}
      */
-    protected function setUp()
+    protected function setUp(): void
     {
         parent::setUp();