diff --git a/src/Command/ClearExpiredTokensCommand.php b/src/Command/ClearExpiredTokensCommand.php
index 16c6985b..05f1d3ee 100644
--- a/src/Command/ClearExpiredTokensCommand.php
+++ b/src/Command/ClearExpiredTokensCommand.php
@@ -103,7 +103,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
     private function clearExpiredAccessTokens(SymfonyStyle $io): void
     {
         $numOfClearedAccessTokens = $this->accessTokenManager->clearExpired();
-        $io->success(sprintf(
+        $io->success(\sprintf(
             'Cleared %d expired access token%s.',
             $numOfClearedAccessTokens,
             1 === $numOfClearedAccessTokens ? '' : 's'
@@ -113,7 +113,7 @@ private function clearExpiredAccessTokens(SymfonyStyle $io): void
     private function clearExpiredRefreshTokens(SymfonyStyle $io): void
     {
         $numOfClearedRefreshTokens = $this->refreshTokenManager->clearExpired();
-        $io->success(sprintf(
+        $io->success(\sprintf(
             'Cleared %d expired refresh token%s.',
             $numOfClearedRefreshTokens,
             1 === $numOfClearedRefreshTokens ? '' : 's'
@@ -123,7 +123,7 @@ private function clearExpiredRefreshTokens(SymfonyStyle $io): void
     private function clearExpiredAuthCodes(SymfonyStyle $io): void
     {
         $numOfClearedAuthCodes = $this->authorizationCodeManager->clearExpired();
-        $io->success(sprintf(
+        $io->success(\sprintf(
             'Cleared %d expired auth code%s.',
             $numOfClearedAuthCodes,
             1 === $numOfClearedAuthCodes ? '' : 's'
diff --git a/src/Command/DeleteClientCommand.php b/src/Command/DeleteClientCommand.php
index 73302780..7caae395 100644
--- a/src/Command/DeleteClientCommand.php
+++ b/src/Command/DeleteClientCommand.php
@@ -44,7 +44,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $io = new SymfonyStyle($input, $output);
 
         if (null === $client = $this->clientManager->find($input->getArgument('identifier'))) {
-            $io->error(sprintf('OAuth2 client identified as "%s" does not exist.', $input->getArgument('identifier')));
+            $io->error(\sprintf('OAuth2 client identified as "%s" does not exist.', $input->getArgument('identifier')));
 
             return 1;
         }
diff --git a/src/Command/GenerateKeyPairCommand.php b/src/Command/GenerateKeyPairCommand.php
index 4938478b..4b33d4ba 100644
--- a/src/Command/GenerateKeyPairCommand.php
+++ b/src/Command/GenerateKeyPairCommand.php
@@ -68,7 +68,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $io = new SymfonyStyle($input, $output);
 
         if (!\in_array($this->algorithm, self::ACCEPTED_ALGORITHMS, true)) {
-            $io->error(sprintf('Cannot generate key pair with the provided algorithm `%s`.', $this->algorithm));
+            $io->error(\sprintf('Cannot generate key pair with the provided algorithm `%s`.', $this->algorithm));
 
             return Command::FAILURE;
         }
@@ -78,10 +78,10 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         if ($input->getOption('dry-run')) {
             $io->success('Your keys have been generated!');
             $io->newLine();
-            $io->writeln(sprintf('Update your private key in <info>%s</info>:', $this->secretKey));
+            $io->writeln(\sprintf('Update your private key in <info>%s</info>:', $this->secretKey));
             $io->writeln($secretKey);
             $io->newLine();
-            $io->writeln(sprintf('Update your public key in <info>%s</info>:', $this->publicKey));
+            $io->writeln(\sprintf('Update your public key in <info>%s</info>:', $this->publicKey));
             $io->writeln($publicKey);
 
             return Command::SUCCESS;
diff --git a/src/Command/UpdateClientCommand.php b/src/Command/UpdateClientCommand.php
index c462a60d..529dd69e 100644
--- a/src/Command/UpdateClientCommand.php
+++ b/src/Command/UpdateClientCommand.php
@@ -57,7 +57,7 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         $io = new SymfonyStyle($input, $output);
 
         if (null === $client = $this->clientManager->find($input->getArgument('identifier'))) {
-            $io->error(sprintf('OAuth2 client identified as "%s" does not exist.', $input->getArgument('identifier')));
+            $io->error(\sprintf('OAuth2 client identified as "%s" does not exist.', $input->getArgument('identifier')));
 
             return 1;
         }
@@ -107,13 +107,13 @@ private function getClientActiveFromInput(InputInterface $input, bool $actual):
     private function getClientRelatedModelsFromInput(InputInterface $input, string $modelFqcn, array $actual, string $argument): array
     {
         /** @var list<string> $toAdd */
-        $toAdd = $input->getOption($addArgument = sprintf('add-%s', $argument));
+        $toAdd = $input->getOption($addArgument = \sprintf('add-%s', $argument));
 
         /** @var list<string> $toRemove */
-        $toRemove = $input->getOption($removeArgument = sprintf('remove-%s', $argument));
+        $toRemove = $input->getOption($removeArgument = \sprintf('remove-%s', $argument));
 
         if ([] !== $colliding = array_intersect($toAdd, $toRemove)) {
-            throw new \RuntimeException(sprintf('Cannot specify "%s" in either "--%s" and "--%s".', implode('", "', $colliding), $addArgument, $removeArgument));
+            throw new \RuntimeException(\sprintf('Cannot specify "%s" in either "--%s" and "--%s".', implode('", "', $colliding), $addArgument, $removeArgument));
         }
 
         $filtered = array_filter($actual, static function ($model) use ($toRemove): bool {
diff --git a/src/DBAL/Type/ImplodedArray.php b/src/DBAL/Type/ImplodedArray.php
index 89d7ddae..3da2c536 100644
--- a/src/DBAL/Type/ImplodedArray.php
+++ b/src/DBAL/Type/ImplodedArray.php
@@ -83,7 +83,7 @@ private function assertValueCanBeImploded($value): void
             return;
         }
 
-        throw new \InvalidArgumentException(sprintf('The value of \'%s\' type cannot be imploded.', \gettype($value)));
+        throw new \InvalidArgumentException(\sprintf('The value of \'%s\' type cannot be imploded.', \gettype($value)));
     }
 
     /**
diff --git a/src/DependencyInjection/CompilerPass/EncryptionKeyPass.php b/src/DependencyInjection/CompilerPass/EncryptionKeyPass.php
index 04e8fb35..d453d36a 100644
--- a/src/DependencyInjection/CompilerPass/EncryptionKeyPass.php
+++ b/src/DependencyInjection/CompilerPass/EncryptionKeyPass.php
@@ -44,6 +44,6 @@ public function process(ContainerBuilder $container): void
             return;
         }
 
-        throw new \RuntimeException(sprintf('The value "%s" is not allowed for path "league_oauth2_server.authorization_server.encryption_key_type". Permissible values: "plain", "defuse"', $encryptionKeyType));
+        throw new \RuntimeException(\sprintf('The value "%s" is not allowed for path "league_oauth2_server.authorization_server.encryption_key_type". Permissible values: "plain", "defuse"', $encryptionKeyType));
     }
 }
diff --git a/src/DependencyInjection/Configuration.php b/src/DependencyInjection/Configuration.php
index 3ab21af2..c3566b79 100644
--- a/src/DependencyInjection/Configuration.php
+++ b/src/DependencyInjection/Configuration.php
@@ -55,7 +55,7 @@ private function createAuthorizationServerNode(): NodeDefinition
                     ->defaultValue(null)
                 ->end()
                 ->scalarNode('encryption_key')
-                    ->info(sprintf("The plain string or the ascii safe string used to create a %s to be used as an encryption key.\nHow to generate an encryption key: https://oauth2.thephpleague.com/installation/#string-password", Key::class))
+                    ->info(\sprintf("The plain string or the ascii safe string used to create a %s to be used as an encryption key.\nHow to generate an encryption key: https://oauth2.thephpleague.com/installation/#string-password", Key::class))
                     ->isRequired()
                     ->cannotBeEmpty()
                 ->end()
@@ -240,13 +240,13 @@ private function createClientNode(): NodeDefinition
             ->addDefaultsIfNotSet()
             ->children()
                 ->scalarNode('classname')
-                    ->info(sprintf('Set a custom client class. Must be a %s', AbstractClient::class))
+                    ->info(\sprintf('Set a custom client class. Must be a %s', AbstractClient::class))
                     ->defaultValue(Client::class)
                     ->validate()
                         ->ifTrue(function ($v) {
                             return !is_a($v, AbstractClient::class, true);
                         })
-                        ->thenInvalid(sprintf('%%s must be a %s', AbstractClient::class))
+                        ->thenInvalid(\sprintf('%%s must be a %s', AbstractClient::class))
                     ->end()
                 ->end()
             ->end()
diff --git a/src/DependencyInjection/LeagueOAuth2ServerExtension.php b/src/DependencyInjection/LeagueOAuth2ServerExtension.php
index 25e76df3..1abf8809 100644
--- a/src/DependencyInjection/LeagueOAuth2ServerExtension.php
+++ b/src/DependencyInjection/LeagueOAuth2ServerExtension.php
@@ -126,7 +126,7 @@ private function assertRequiredBundlesAreEnabled(ContainerBuilder $container): v
 
         foreach ($requiredBundles as $bundleAlias => $requiredBundle) {
             if (!$container->hasExtension($bundleAlias)) {
-                throw new \LogicException(sprintf('Bundle \'%s\' needs to be enabled in your application kernel.', $requiredBundle));
+                throw new \LogicException(\sprintf('Bundle \'%s\' needs to be enabled in your application kernel.', $requiredBundle));
             }
         }
     }
@@ -260,7 +260,7 @@ private function configureDoctrinePersistence(ContainerBuilder $container, array
         $entityManagerName = $persistenceConfig['entity_manager'];
 
         $entityManager = new Reference(
-            sprintf('doctrine.orm.%s_entity_manager', $entityManagerName)
+            \sprintf('doctrine.orm.%s_entity_manager', $entityManagerName)
         );
 
         $container
@@ -339,7 +339,7 @@ private function configureScopes(ContainerBuilder $container, array $scopes): vo
         $defaultScopes = $scopes['default'];
 
         if ([] !== $invalidDefaultScopes = array_diff($defaultScopes, $availableScopes)) {
-            throw new \LogicException(sprintf('Invalid default scopes "%s" for path "league_oauth2_server.scopes.default". Permissible values: "%s"', implode('", "', $invalidDefaultScopes), implode('", "', $availableScopes)));
+            throw new \LogicException(\sprintf('Invalid default scopes "%s" for path "league_oauth2_server.scopes.default". Permissible values: "%s"', implode('", "', $invalidDefaultScopes), implode('", "', $availableScopes)));
         }
 
         $container->setParameter('league.oauth2_server.scopes.default', $defaultScopes);
diff --git a/src/DependencyInjection/Security/OAuth2FactoryTrait.php b/src/DependencyInjection/Security/OAuth2FactoryTrait.php
index 95d339ea..9453ec3a 100644
--- a/src/DependencyInjection/Security/OAuth2FactoryTrait.php
+++ b/src/DependencyInjection/Security/OAuth2FactoryTrait.php
@@ -23,7 +23,7 @@ public function create(ContainerBuilder $container, $id, $config, $userProvider,
 
     public function createAuthenticator(ContainerBuilder $container, string $firewallName, array $config, string $userProviderId): string
     {
-        $authenticator = sprintf('security.authenticator.oauth2.%s', $firewallName);
+        $authenticator = \sprintf('security.authenticator.oauth2.%s', $firewallName);
 
         $definition = new ChildDefinition(OAuth2Authenticator::class);
         $definition->replaceArgument(2, new Reference($userProviderId));
diff --git a/src/Event/AuthorizationRequestResolveEventFactory.php b/src/Event/AuthorizationRequestResolveEventFactory.php
index 07bc2a9f..c928a62d 100644
--- a/src/Event/AuthorizationRequestResolveEventFactory.php
+++ b/src/Event/AuthorizationRequestResolveEventFactory.php
@@ -33,7 +33,7 @@ public function fromAuthorizationRequest(AuthorizationRequest $authorizationRequ
         $client = $this->clientManager->find($authorizationRequest->getClient()->getIdentifier());
 
         if (null === $client) {
-            throw new \RuntimeException(sprintf('No client found for the given identifier \'%s\'.', $authorizationRequest->getClient()->getIdentifier()));
+            throw new \RuntimeException(\sprintf('No client found for the given identifier \'%s\'.', $authorizationRequest->getClient()->getIdentifier()));
         }
 
         return new AuthorizationRequestResolveEvent($authorizationRequest, $scopes, $client);
diff --git a/src/Persistence/Mapping/Driver.php b/src/Persistence/Mapping/Driver.php
index 9e2b8acb..126e0330 100644
--- a/src/Persistence/Mapping/Driver.php
+++ b/src/Persistence/Mapping/Driver.php
@@ -62,7 +62,7 @@ public function loadMetadataForClass($className, ClassMetadata $metadata): void
 
                 break;
             default:
-                throw new \RuntimeException(sprintf('%s cannot load metadata for class %s', __CLASS__, $className));
+                throw new \RuntimeException(\sprintf('%s cannot load metadata for class %s', __CLASS__, $className));
         }
     }
 
diff --git a/src/Security/Authentication/Token/OAuth2Token.php b/src/Security/Authentication/Token/OAuth2Token.php
index a9dc7c33..53c225ee 100644
--- a/src/Security/Authentication/Token/OAuth2Token.php
+++ b/src/Security/Authentication/Token/OAuth2Token.php
@@ -28,7 +28,7 @@ public function __construct(
 
         // Build roles from scope
         $roles = array_map(function (string $scope) use ($rolePrefix): string {
-            return strtoupper(trim(sprintf('%s%s', $rolePrefix, $scope)));
+            return strtoupper(trim(\sprintf('%s%s', $rolePrefix, $scope)));
         }, $scopes);
 
         if (null !== $user) {
diff --git a/src/Security/Authenticator/OAuth2Authenticator.php b/src/Security/Authenticator/OAuth2Authenticator.php
index ffd98d7a..2050ee79 100644
--- a/src/Security/Authenticator/OAuth2Authenticator.php
+++ b/src/Security/Authenticator/OAuth2Authenticator.php
@@ -123,7 +123,7 @@ public function doAuthenticate(Request $request) /* : Passport */
     public function createAuthenticatedToken(PassportInterface $passport, string $firewallName): TokenInterface
     {
         if (!$passport instanceof Passport) {
-            throw new \RuntimeException(sprintf('Cannot create a OAuth2 authenticated token. $passport should be a %s', Passport::class));
+            throw new \RuntimeException(\sprintf('Cannot create a OAuth2 authenticated token. $passport should be a %s', Passport::class));
         }
 
         $token = $this->createToken($passport, $firewallName);
diff --git a/src/ValueObject/RedirectUri.php b/src/ValueObject/RedirectUri.php
index f8450a82..c4f2b70e 100644
--- a/src/ValueObject/RedirectUri.php
+++ b/src/ValueObject/RedirectUri.php
@@ -20,7 +20,7 @@ class RedirectUri
     public function __construct(string $redirectUri)
     {
         if (!filter_var($redirectUri, \FILTER_VALIDATE_URL)) {
-            throw new \RuntimeException(sprintf('The \'%s\' string is not a valid URI.', $redirectUri));
+            throw new \RuntimeException(\sprintf('The \'%s\' string is not a valid URI.', $redirectUri));
         }
 
         $this->redirectUri = $redirectUri;
diff --git a/tests/Acceptance/DeleteClientCommandTest.php b/tests/Acceptance/DeleteClientCommandTest.php
index 9de26327..cf973821 100644
--- a/tests/Acceptance/DeleteClientCommandTest.php
+++ b/tests/Acceptance/DeleteClientCommandTest.php
@@ -42,7 +42,7 @@ public function testDeleteNonExistentClient(): void
             'identifier' => $identifierName,
         ]);
         $output = $commandTester->getDisplay();
-        $this->assertStringContainsString(sprintf('OAuth2 client identified as "%s" does not exist.', $identifierName), $output);
+        $this->assertStringContainsString(\sprintf('OAuth2 client identified as "%s" does not exist.', $identifierName), $output);
     }
 
     private function findClient(string $identifier): ?Client
diff --git a/tests/Acceptance/SecurityLayerTest.php b/tests/Acceptance/SecurityLayerTest.php
index e54d6933..f67272f9 100644
--- a/tests/Acceptance/SecurityLayerTest.php
+++ b/tests/Acceptance/SecurityLayerTest.php
@@ -35,7 +35,7 @@ public function testAuthenticatedGuestRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_PUBLIC);
 
         $this->client->request('GET', '/security-test', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -52,7 +52,7 @@ public function testAuthenticatedGuestScopedRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_WITH_SCOPES);
 
         $this->client->request('GET', '/security-test-scopes', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -69,7 +69,7 @@ public function testAuthenticatedUserRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_USER_BOUND);
 
         $this->client->request('GET', '/security-test', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -86,7 +86,7 @@ public function testAuthenticatedUserRolesRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_USER_BOUND_WITH_SCOPES);
 
         $this->client->request('GET', '/security-test-roles', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -103,7 +103,7 @@ public function testSuccessfulAuthorizationForAuthenticatedUserRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_USER_BOUND_WITH_SCOPES);
 
         $this->client->request('GET', '/security-test-authorization', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -120,7 +120,7 @@ public function testUnsuccessfulAuthorizationForAuthenticatedUserRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_USER_BOUND);
 
         $this->client->request('GET', '/security-test-authorization', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -137,7 +137,7 @@ public function testExpiredRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_EXPIRED);
 
         $this->client->request('GET', '/security-test', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -153,7 +153,7 @@ public function testRevokedRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_REVOKED);
 
         $this->client->request('GET', '/security-test', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
@@ -169,7 +169,7 @@ public function testInsufficientScopeRequest(): void
             ->find(FixtureFactory::FIXTURE_ACCESS_TOKEN_PUBLIC);
 
         $this->client->request('GET', '/security-test-scopes', [], [], [
-            'HTTP_AUTHORIZATION' => sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
+            'HTTP_AUTHORIZATION' => \sprintf('Bearer %s', TestHelper::generateJwtToken($accessToken)),
         ]);
 
         $response = $this->client->getResponse();
diff --git a/tests/Acceptance/UpdateClientCommandTest.php b/tests/Acceptance/UpdateClientCommandTest.php
index 77ae5430..c0150206 100644
--- a/tests/Acceptance/UpdateClientCommandTest.php
+++ b/tests/Acceptance/UpdateClientCommandTest.php
@@ -29,21 +29,21 @@ public function testUpdateRelatedModels(string $argument, array $initial, array
         $commandTester->execute([
             'command' => $command->getName(),
             'identifier' => $client->getIdentifier(),
-            sprintf('--add-%s', $argument) => $toAdd,
-            sprintf('--remove-%s', $argument) => $toRemove,
+            \sprintf('--add-%s', $argument) => $toAdd,
+            \sprintf('--remove-%s', $argument) => $toRemove,
         ]);
         $output = $commandTester->getDisplay();
         $this->assertStringContainsString('OAuth2 client updated successfully.', $output);
         $this->assertEquals($expected, $client->{$getter}());
 
         $this->expectException(\RuntimeException::class);
-        $this->expectExceptionMessage(sprintf('Cannot specify "%s" in either "--add-%2$s" and "--remove-%2$s".', $toAdd[0], $argument));
+        $this->expectExceptionMessage(\sprintf('Cannot specify "%s" in either "--add-%2$s" and "--remove-%2$s".', $toAdd[0], $argument));
 
         $commandTester->execute([
             'command' => $command->getName(),
             'identifier' => $client->getIdentifier(),
-            sprintf('--add-%s', $argument) => [$toAdd[0]],
-            sprintf('--remove-%s', $argument) => [$toAdd[0]],
+            \sprintf('--add-%s', $argument) => [$toAdd[0]],
+            \sprintf('--remove-%s', $argument) => [$toAdd[0]],
         ]);
     }
 
diff --git a/tests/Fixtures/SecurityTestController.php b/tests/Fixtures/SecurityTestController.php
index 47d8dd1d..c6739f31 100644
--- a/tests/Fixtures/SecurityTestController.php
+++ b/tests/Fixtures/SecurityTestController.php
@@ -28,7 +28,7 @@ public function helloAction(): Response
         $user = $this->getUser();
 
         return new Response(
-            sprintf('Hello, %s', null === $user || $user instanceof NullUser ? 'guest' : (method_exists($user, 'getUserIdentifier') ? $user->getUserIdentifier() : $user->getUsername()))
+            \sprintf('Hello, %s', null === $user || $user instanceof NullUser ? 'guest' : (method_exists($user, 'getUserIdentifier') ? $user->getUserIdentifier() : $user->getUsername()))
         );
     }
 
@@ -42,7 +42,7 @@ public function rolesAction(): Response
         $roles = $this->tokenStorage->getToken()->getRoleNames();
 
         return new Response(
-            sprintf(
+            \sprintf(
                 'These are the roles I have currently assigned: %s',
                 implode(', ', $roles)
             )
diff --git a/tests/Integration/AbstractIntegrationTest.php b/tests/Integration/AbstractIntegrationTest.php
index 51acbb05..d4d09a49 100644
--- a/tests/Integration/AbstractIntegrationTest.php
+++ b/tests/Integration/AbstractIntegrationTest.php
@@ -173,7 +173,7 @@ protected function createAuthorizationRequest(?string $credentials, array $body
         ;
 
         if (null !== $credentials) {
-            $request = $request->withHeader('Authorization', sprintf('Basic %s', base64_encode($credentials)));
+            $request = $request->withHeader('Authorization', \sprintf('Basic %s', base64_encode($credentials)));
         }
 
         return $request;
@@ -184,7 +184,7 @@ protected function createResourceRequest(string $jwtToken): ServerRequestInterfa
         return $this
             ->psrFactory
             ->createServerRequest('', '')
-            ->withHeader('Authorization', sprintf('Bearer %s', $jwtToken))
+            ->withHeader('Authorization', \sprintf('Bearer %s', $jwtToken))
         ;
     }
 
@@ -196,7 +196,7 @@ protected function createAuthorizeRequest(?string $credentials, array $query = [
             ->withQueryParams($query)
         ;
 
-        return \is_string($credentials) ? $serverRequest->withHeader('Authorization', sprintf('Basic %s', base64_encode($credentials))) : $serverRequest;
+        return \is_string($credentials) ? $serverRequest->withHeader('Authorization', \sprintf('Basic %s', base64_encode($credentials))) : $serverRequest;
     }
 
     protected function handleTokenRequest(ServerRequestInterface $serverRequest): array
diff --git a/tests/TestKernel.php b/tests/TestKernel.php
index dbd560c6..89d9f40b 100644
--- a/tests/TestKernel.php
+++ b/tests/TestKernel.php
@@ -52,12 +52,12 @@ public function registerBundles(): iterable
 
     public function getCacheDir(): string
     {
-        return sprintf('%s/tests/.kernel/cache', $this->getProjectDir());
+        return \sprintf('%s/tests/.kernel/cache', $this->getProjectDir());
     }
 
     public function getLogDir(): string
     {
-        return sprintf('%s/tests/.kernel/logs', $this->getProjectDir());
+        return \sprintf('%s/tests/.kernel/logs', $this->getProjectDir());
     }
 
     public function process(ContainerBuilder $container): void
@@ -235,8 +235,8 @@ private function registerFakeGrant(ContainerBuilder $container): void
 
     private function initializeEnvironmentVariables(): void
     {
-        putenv(sprintf('PRIVATE_KEY_PATH=%s', TestHelper::PRIVATE_KEY_PATH));
-        putenv(sprintf('PUBLIC_KEY_PATH=%s', TestHelper::PUBLIC_KEY_PATH));
-        putenv(sprintf('ENCRYPTION_KEY=%s', TestHelper::ENCRYPTION_KEY));
+        putenv(\sprintf('PRIVATE_KEY_PATH=%s', TestHelper::PRIVATE_KEY_PATH));
+        putenv(\sprintf('PUBLIC_KEY_PATH=%s', TestHelper::PUBLIC_KEY_PATH));
+        putenv(\sprintf('ENCRYPTION_KEY=%s', TestHelper::ENCRYPTION_KEY));
     }
 }
diff --git a/tests/Unit/OAuth2TokenTest.php b/tests/Unit/OAuth2TokenTest.php
index b0bcc4e4..ba37373d 100644
--- a/tests/Unit/OAuth2TokenTest.php
+++ b/tests/Unit/OAuth2TokenTest.php
@@ -29,7 +29,7 @@ public function testTokenSerialization(): void
         $this->assertSame($accessTokenId, $token->getCredentials());
         $this->assertSame($oauthClientId, $token->getOAuthClientId());
         $this->assertSame($scopes, $token->getScopes());
-        $this->assertSame([sprintf('%s%s', $rolePrefix, strtoupper($scopes[0]))], $token->getRoleNames());
+        $this->assertSame([\sprintf('%s%s', $rolePrefix, strtoupper($scopes[0]))], $token->getRoleNames());
 
         if (!interface_exists(CacheableVoterInterface::class)) {
             $this->assertFalse($unserializedToken->isAuthenticated());