diff --git a/psalm-baseline.xml b/psalm-baseline.xml
index 979297d..5abe178 100644
--- a/psalm-baseline.xml
+++ b/psalm-baseline.xml
@@ -1,26 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <files psalm-version="5.9.0@8b9ad1eb9e8b7d3101f949291da2b9f7767cd163">
-  <file src="src/LaminasRbac.php">
-    <MixedArgument>
-      <code>$routeName</code>
-    </MixedArgument>
-    <MixedAssignment>
-      <code>$routeName</code>
-      <code>$routeResult</code>
-    </MixedAssignment>
-    <MixedMethodCall>
-      <code>getMatchedRouteName</code>
-      <code>isFailure</code>
-    </MixedMethodCall>
-    <UndefinedInterfaceMethod>
-      <code>setRequest</code>
-    </UndefinedInterfaceMethod>
-  </file>
-  <file src="src/LaminasRbacAssertionInterface.php">
-    <PossiblyUnusedMethod>
-      <code>setRequest</code>
-    </PossiblyUnusedMethod>
-  </file>
   <file src="src/LaminasRbacFactory.php">
     <MixedArgument>
       <code>$assertion</code>
@@ -33,13 +12,8 @@
       <code>$role</code>
       <code>$role</code>
     </MixedArgumentTypeCoercion>
-    <MixedArrayAccess>
-      <code><![CDATA[$config['permissions']]]></code>
-      <code><![CDATA[$config['roles']]]></code>
-    </MixedArrayAccess>
     <MixedAssignment>
       <code>$assertion</code>
-      <code>$config</code>
       <code>$parents</code>
       <code>$permission</code>
       <code>$permissions</code>
diff --git a/src/LaminasRbac.php b/src/LaminasRbac.php
index 822c9be..93d2dc2 100644
--- a/src/LaminasRbac.php
+++ b/src/LaminasRbac.php
@@ -4,27 +4,22 @@
 
 namespace Mezzio\Authorization\Rbac;
 
-use Laminas\Permissions\Rbac\AssertionInterface;
 use Laminas\Permissions\Rbac\Rbac;
 use Mezzio\Authorization\AuthorizationInterface;
 use Mezzio\Authorization\Exception;
 use Mezzio\Router\RouteResult;
 use Psr\Http\Message\ServerRequestInterface;
 
+use function assert;
+use function is_string;
 use function sprintf;
 
 class LaminasRbac implements AuthorizationInterface
 {
-    /** @var Rbac */
-    private $rbac;
-
-    /** @var null|AssertionInterface */
-    private $assertion;
-
-    public function __construct(Rbac $rbac, ?LaminasRbacAssertionInterface $assertion = null)
-    {
-        $this->rbac      = $rbac;
-        $this->assertion = $assertion;
+    public function __construct(
+        private Rbac $rbac,
+        private ?LaminasRbacAssertionInterface $assertion = null
+    ) {
     }
 
     /**
@@ -35,7 +30,7 @@ public function __construct(Rbac $rbac, ?LaminasRbacAssertionInterface $assertio
     public function isGranted(string $role, ServerRequestInterface $request): bool
     {
         $routeResult = $request->getAttribute(RouteResult::class, false);
-        if (false === $routeResult) {
+        if (! $routeResult instanceof RouteResult) {
             throw new Exception\RuntimeException(sprintf(
                 'The %s attribute is missing in the request; cannot perform authorizations',
                 RouteResult::class
@@ -48,6 +43,7 @@ public function isGranted(string $role, ServerRequestInterface $request): bool
         }
 
         $routeName = $routeResult->getMatchedRouteName();
+        assert(is_string($routeName));
         if (null !== $this->assertion) {
             $this->assertion->setRequest($request);
         }
diff --git a/src/LaminasRbacFactory.php b/src/LaminasRbacFactory.php
index b30c438..6e48dbe 100644
--- a/src/LaminasRbacFactory.php
+++ b/src/LaminasRbacFactory.php
@@ -4,6 +4,7 @@
 
 namespace Mezzio\Authorization\Rbac;
 
+use ArrayAccess;
 use Laminas\Permissions\Rbac\Exception\ExceptionInterface as RbacExceptionInterface;
 use Laminas\Permissions\Rbac\Rbac;
 use Mezzio\Authorization\AuthorizationInterface;
@@ -11,6 +12,7 @@
 use Psr\Container\ContainerInterface;
 use Zend\Expressive\Authorization\Rbac\ZendRbacAssertionInterface;
 
+use function is_array;
 use function sprintf;
 
 class LaminasRbacFactory
@@ -21,7 +23,7 @@ class LaminasRbacFactory
     public function __invoke(ContainerInterface $container): AuthorizationInterface
     {
         $config = $container->get('config')['mezzio-authorization-rbac'] ?? null;
-        if (null === $config) {
+        if (! is_array($config) && ! $config instanceof ArrayAccess) {
             throw new Exception\InvalidConfigException(sprintf(
                 'Cannot create %s instance; no "mezzio-authorization-rbac" config key present',
                 LaminasRbac::class