diff --git a/tests/Resolver/BounceTypeResolverTest.php b/tests/Resolver/BounceTypeResolverTest.php
index 27b098a..d364039 100644
--- a/tests/Resolver/BounceTypeResolverTest.php
+++ b/tests/Resolver/BounceTypeResolverTest.php
@@ -17,7 +17,7 @@ public function testResolveBounceMessagesCorrectly(string $expected, string $bou
         self::assertEquals($expected, $resolver->resolve($bounceReason));
     }
 
-    public function provideBounceReasons(): iterable
+    public static function provideBounceReasons(): iterable
     {
         yield 'DMarc failure' => [BounceTypeResolver::BOUNCE_REASON_DMARC_FAILURE, 'Email rejected per DMARC policy'];
         yield 'Blacklisted' => [BounceTypeResolver::BOUNCE_REASON_BLACKLISTED, 'LPN007_510'];
diff --git a/tests/Resolver/ProviderResolverTest.php b/tests/Resolver/ProviderResolverTest.php
index f0765aa..b0f88cf 100644
--- a/tests/Resolver/ProviderResolverTest.php
+++ b/tests/Resolver/ProviderResolverTest.php
@@ -22,7 +22,7 @@ public function testProviderResolverReturnsTheRightProvider(string $address, ?st
         self::assertSame($provider, $resolver->resolve($address));
     }
 
-    public function provideAddressesAndProviders(): iterable
+    public static function provideAddressesAndProviders(): iterable
     {
         // Without DNS check
         yield ['john@hotmail.com', 'microsoft'];
diff --git a/tests/Specification/BounceIsCausedByInactiveUserSpecificationTest.php b/tests/Specification/BounceIsCausedByInactiveUserSpecificationTest.php
index df2ea51..5bbeedf 100644
--- a/tests/Specification/BounceIsCausedByInactiveUserSpecificationTest.php
+++ b/tests/Specification/BounceIsCausedByInactiveUserSpecificationTest.php
@@ -17,7 +17,7 @@ public function testSpecificationWorks(string $message, bool $isSpam): void
     }
 
     /** @return array{string, bool}[] */
-    public function provideMessages(): iterable
+    public static function provideMessages(): iterable
     {
         yield ['Email rejected per SPAM policy', false];
         yield [
diff --git a/tests/Specification/BounceIsCausedByOverQuotaSpecificationTest.php b/tests/Specification/BounceIsCausedByOverQuotaSpecificationTest.php
index b11cbbc..94dc64a 100644
--- a/tests/Specification/BounceIsCausedByOverQuotaSpecificationTest.php
+++ b/tests/Specification/BounceIsCausedByOverQuotaSpecificationTest.php
@@ -17,7 +17,7 @@ public function testSpecificationWorks(string $message, bool $isSpam): void
     }
 
     /** @return array{string, bool}[] */
-    public function provideMessages(): iterable
+    public static function provideMessages(): iterable
     {
         yield ['Email rejected per SPAM policy', false];
         yield [
diff --git a/tests/Specification/BounceIsCausedByUnknownUserSpecificationTest.php b/tests/Specification/BounceIsCausedByUnknownUserSpecificationTest.php
index 1e95b5b..57c71c5 100644
--- a/tests/Specification/BounceIsCausedByUnknownUserSpecificationTest.php
+++ b/tests/Specification/BounceIsCausedByUnknownUserSpecificationTest.php
@@ -17,7 +17,7 @@ public function testSpecificationWorks(string $message, bool $isSpam): void
     }
 
     /** @return array{string, bool}[] */
-    public function provideMessages(): iterable
+    public static function provideMessages(): iterable
     {
         yield ['Email rejected per SPAM policy', false];
         yield ['Sender address rejected: Sender user unknown.  Adresse expediteur inconnue', true];
diff --git a/tests/Specification/BounceIsSpamRelatedSpecificationTest.php b/tests/Specification/BounceIsSpamRelatedSpecificationTest.php
index 47fb273..923d9db 100644
--- a/tests/Specification/BounceIsSpamRelatedSpecificationTest.php
+++ b/tests/Specification/BounceIsSpamRelatedSpecificationTest.php
@@ -18,7 +18,7 @@ public function testSpecificationWorks(string $message, bool $isSpam): void
     }
 
     /** @return array{string, bool}[] */
-    public function provideMessages(): iterable
+    public static function provideMessages(): iterable
     {
         yield ['Email rejected per SPAM policy', true];
         yield ['Sender address rejected: Sender user unknown.  Adresse expediteur inconnue', false];
diff --git a/tests/Specification/BounceReasonIsUnknownSpecificationTest.php b/tests/Specification/BounceReasonIsUnknownSpecificationTest.php
index 1756bbf..c47373f 100644
--- a/tests/Specification/BounceReasonIsUnknownSpecificationTest.php
+++ b/tests/Specification/BounceReasonIsUnknownSpecificationTest.php
@@ -17,7 +17,7 @@ public function testSpecificationWorks(string $message, bool $isSpam): void
     }
 
     /** @return array{string, bool}[] */
-    public function provideMessages(): iterable
+    public static function provideMessages(): iterable
     {
         yield ['hard bounce', true];
         yield ['Sender address rejected: Sender user unknown.  Adresse expediteur inconnue', false];
diff --git a/tests/Specification/EmailAddressIsFromACountrySpecificationTest.php b/tests/Specification/EmailAddressIsFromACountrySpecificationTest.php
index 7ed8e18..aeabce0 100644
--- a/tests/Specification/EmailAddressIsFromACountrySpecificationTest.php
+++ b/tests/Specification/EmailAddressIsFromACountrySpecificationTest.php
@@ -22,7 +22,7 @@ public function testSpecificationWorks(string $emailAddress, string $country, bo
         self::assertSame($isSatisfiedBy, $spec->isSatisfiedBy($emailAddress, $country));
     }
 
-    public function provideEmailAddresses(): iterable
+    public static function provideEmailAddresses(): iterable
     {
         // Invalid
         yield ['hello', 'FR', false];
diff --git a/tests/Specification/EmailAddressIsFromAProviderSpecificationTest.php b/tests/Specification/EmailAddressIsFromAProviderSpecificationTest.php
index 4809834..97d79b1 100644
--- a/tests/Specification/EmailAddressIsFromAProviderSpecificationTest.php
+++ b/tests/Specification/EmailAddressIsFromAProviderSpecificationTest.php
@@ -19,7 +19,7 @@ public function testSpecificationWorks(string $emailAddress, string $providerNam
         self::assertSame($isSatisfiedBy, $spec->isSatisfiedBy($emailAddress, $providerName, true));
     }
 
-    public function provideEmailAddresses(): iterable
+    public static function provideEmailAddresses(): iterable
     {
         yield ['invalid email', '', false];
         yield ['unknow provider', 'provider that does not exist', false];
diff --git a/tests/Translatable/BounceReasonTranslatableTest.php b/tests/Translatable/BounceReasonTranslatableTest.php
index 8626c3f..c0ce92e 100644
--- a/tests/Translatable/BounceReasonTranslatableTest.php
+++ b/tests/Translatable/BounceReasonTranslatableTest.php
@@ -26,7 +26,7 @@ public function testBounceReasonTranslatable(string $reason, string $expectedTra
     /**
      * @return iterable<mixed>
      */
-    public function providerTrans(): iterable
+    public static function providerTrans(): iterable
     {
         yield 'code' => [
             '2.2.1 test code',
diff --git a/tests/Validation/SmtpValidatorTest.php b/tests/Validation/SmtpValidatorTest.php
index 78278c1..c85f32e 100644
--- a/tests/Validation/SmtpValidatorTest.php
+++ b/tests/Validation/SmtpValidatorTest.php
@@ -49,7 +49,7 @@ public function testClientWorks(string $email, string $expectedDtoClass): void
     }
 
     /** @return array{0: string, 1: class-string<ValidationStatusDtoInterface>}[] */
-    public function provideEmailAddresses(): iterable
+    public static function provideEmailAddresses(): iterable
     {
         yield ['this_user_does_not_exist', InvalidAddressDto::class];
         yield ['this_user_does_not_exist@this_domain_does_not_exist', InvalidAddressDto::class];