diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 0000000..6a598c5
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1,11 @@
+parameters:
+	ignoreErrors:
+		-
+			message: "#^Call to an undefined method Symfony\\\\Component\\\\Config\\\\Definition\\\\Builder\\\\NodeDefinition\\:\\:children\\(\\)\\.$#"
+			count: 1
+			path: src/DependencyInjection/Configuration.php
+
+		-
+			message: "#^Parameter \\#1 \\$mergedConfig \\(array\\{request_header\\: string, trust_request_header\\: bool, response_header\\: string, storage_service\\: string\\|null, generator_service\\: string\\|null, enable_monolog\\: bool, enable_console\\: bool, enable_twig\\: bool\\}\\) of method DR\\\\SymfonyRequestId\\\\DependencyInjection\\\\SymfonyRequestIdExtension\\:\\:loadInternal\\(\\) should be contravariant with parameter \\$mergedConfig \\(array\\) of method Symfony\\\\Component\\\\HttpKernel\\\\DependencyInjection\\\\ConfigurableExtension\\:\\:loadInternal\\(\\)$#"
+			count: 1
+			path: src/DependencyInjection/SymfonyRequestIdExtension.php
diff --git a/src/RequestIdStorage.php b/src/RequestIdStorage.php
index dfec7b4..765325e 100644
--- a/src/RequestIdStorage.php
+++ b/src/RequestIdStorage.php
@@ -12,7 +12,7 @@ interface RequestIdStorage
     /**
      * @return string|null Null if the request does not have an identifier
      */
-    public function getRequestId() : ?string;
+    public function getRequestId(): ?string;
 
-    public function setRequestId(?string $id) : void;
+    public function setRequestId(?string $id): void;
 }