diff --git a/.gitignore b/.gitignore
index 7f82cee..7c5ecae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,3 +7,8 @@ composer.phar
 # You may choose to ignore a library lock file http://getcomposer.org/doc/02-libraries.md#lock-file
 # composer.lock
 /composer.lock
+
+# Maintenance
+phpcs.xml
+phpunit.xml
+psalm.xml
diff --git a/composer.json b/composer.json
index 139b5ad..1c8e75a 100644
--- a/composer.json
+++ b/composer.json
@@ -10,15 +10,16 @@
   ],
   "require": {
     "php": "~8.1.0 || ~8.2.0 || ~8.3.0",
-    "symfony/config": "*",
-    "symfony/routing": "*",
-    "symfony/http-foundation": "*",
-    "laminas/laminas-router": "*"
+    "symfony/config": "^6.4 || ^7.0",
+    "symfony/routing": "^6.4 || ^7.0",
+    "symfony/http-foundation": "^6.4 || ^7.0",
+    "laminas/laminas-router": "^3.0"
   },
   "require-dev": {
     "laminas/laminas-coding-standard": "~2.5.0",
-    "laminas/laminas-test": "*",
-    "symfony/expression-language": "*"
+    "laminas/laminas-test": "^4.0",
+    "symfony/expression-language": "^6.4 || ^7.0",
+    "vimeo/psalm": "^5.18"
   },
   "suggest": {
     "symfony/expression-language": "to use symfony conditonal routes"
@@ -46,6 +47,7 @@
     "cs-check": "phpcs",
     "cs-fix": "phpcbf",
     "static-analysis": "psalm --shepherd --stats",
+    "static-analysis-all": "psalm --show-info=true",
     "test": "phpunit --colors=always"
   }
 }
diff --git a/config/test/application.global.php b/config/test/application.global.php
index 5672315..483b5ec 100644
--- a/config/test/application.global.php
+++ b/config/test/application.global.php
@@ -6,7 +6,7 @@
     // Retrieve list of modules used in this application.
     'modules' => [
         'Laminas\Router',
-        'Laminas\Router\Attributes',
+        Laminas\Router\Attributes\Module::class,
     ],
 
     // These are various options for the listeners attached to the ModuleManager
diff --git a/psalm.xml.dist b/psalm.xml.dist
new file mode 100644
index 0000000..849eb27
--- /dev/null
+++ b/psalm.xml.dist
@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="7"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns="https://getpsalm.org/schema/config"
+    xsi:schemaLocation="https://getpsalm.org/schema/config vendor/vimeo/psalm/config.xsd"
+    findUnusedBaselineEntry="true"
+    findUnusedCode="true"
+>
+    <projectFiles>
+        <directory name="config" />
+        <directory name="src" />
+        <ignoreFiles>
+            <directory name="vendor" />
+        </ignoreFiles>
+    </projectFiles>
+</psalm>
diff --git a/src/Listener/RoutingAttributesListener.php b/src/Listener/RoutingAttributesListener.php
index 61e7f6c..a756c08 100644
--- a/src/Listener/RoutingAttributesListener.php
+++ b/src/Listener/RoutingAttributesListener.php
@@ -7,7 +7,7 @@
 use Laminas\EventManager\EventManagerInterface;
 use Laminas\EventManager\ListenerAggregateInterface;
 use Laminas\EventManager\ListenerAggregateTrait;
-use Laminas\Http\Request;
+use Laminas\Http\PhpEnvironment\Request;
 use Laminas\Mvc\MvcEvent;
 use Laminas\Router\Attributes\Loader\AttributesClassLoader;
 use Laminas\Router\RouteMatch;
@@ -20,7 +20,7 @@
 
 use function array_keys;
 
-class RoutingAttributesListener implements ListenerAggregateInterface
+final class RoutingAttributesListener implements ListenerAggregateInterface
 {
     use ListenerAggregateTrait;
 
@@ -57,7 +57,7 @@ private function onNoLaminasRouteFound(MvcEvent $event): ?RouteMatch
 
                 $event->setRouteMatch($routeMatch);
                 $event->stopPropagation();
-                $event->setError(null);
+                $event->setError('');
 
                 return $routeMatch;
             } catch (ResourceNotFoundException | MethodNotAllowedException) {