diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index 9c2431b2..76a143ac 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -1,6 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <files psalm-version="5.15.0@5c774aca4746caf3d239d9c8cadb9f882ca29352">
   <file src="src/AbstractStaticResourceHandlerFactory.php">
+    <ArgumentTypeCoercion>
+      <code>$lastModifiedDirectives</code>
+    </ArgumentTypeCoercion>
     <MixedArrayOffset>
       <code>$cacheControlDirectives[$regex]</code>
     </MixedArrayOffset>
diff --git a/src/AbstractStaticResourceHandlerFactory.php b/src/AbstractStaticResourceHandlerFactory.php
index 3fe2866b..1c29956e 100644
--- a/src/AbstractStaticResourceHandlerFactory.php
+++ b/src/AbstractStaticResourceHandlerFactory.php
@@ -51,6 +51,12 @@ abstract public function __invoke(ContainerInterface $container);
      * This method is marked protected to allow users to extend this factory
      * in order to provide their own middleware and/or configuration schema.
      *
+     * @psalm-param $config array{
+     *     type-map?: array<string, string>,
+     *     gzip?: array{level?: int},
+     *     clearstatcache-interval?: int,
+     *     directives?: array<non-empty-string, array{cache-control?: string, last-modified?: bool, etag?: bool}>
+     * },
      * @return StaticResourceHandler\MiddlewareInterface[]
      */
     protected function configureMiddleware(array $config): array