diff --git a/.changeset/few-bees-drum.md b/.changeset/few-bees-drum.md
new file mode 100644
index 0000000..cb39292
--- /dev/null
+++ b/.changeset/few-bees-drum.md
@@ -0,0 +1,5 @@
+---
+"@cambis/silverstan": minor
+---
+
+PHPStan 2.2 upgrade
diff --git a/build/composer-php-74.json b/build/composer-php-74.json
index e13dd8b..11dc3f8 100644
--- a/build/composer-php-74.json
+++ b/build/composer-php-74.json
@@ -18,7 +18,7 @@
     "php": "^7.4 || ^8.0",
     "ext-tokenizer": "*",
     "composer/class-map-generator": "^1.5",
-    "phpstan/phpstan": "^2.1.28",
+    "phpstan/phpstan": "^2.2.1",
     "silverstripe/config": "^1.4 || ^2.0 || ^3.0"
   },
   "minimum-stability": "dev",
diff --git a/composer.json b/composer.json
index e6fcee0..659f0fd 100644
--- a/composer.json
+++ b/composer.json
@@ -18,7 +18,7 @@
         "php": "^8.3",
         "ext-tokenizer": "*",
         "composer/class-map-generator": "^1.5",
-        "phpstan/phpstan": "^2.1.28",
+        "phpstan/phpstan": "^2.2.1",
         "silverstripe/config": "^1.4 || ^2.0 || ^3.0"
     },
     "require-dev": {
diff --git a/src/ConfigurationResolver/ConfigurationResolver.php b/src/ConfigurationResolver/ConfigurationResolver.php
index f6bea17..9895b9b 100644
--- a/src/ConfigurationResolver/ConfigurationResolver.php
+++ b/src/ConfigurationResolver/ConfigurationResolver.php
@@ -107,7 +107,11 @@ public function resolveExtensionClassName(string $extensionName): ?string
             return null;
         }
 
-        $resolved = $matches[1];
+        $resolved = $matches[1] ?? null;
+
+        if ($resolved === null || $resolved === '') {
+            return null;
+        }
 
         if (!$this->reflectionProvider->hasClass($resolved)) {
             return null;
diff --git a/src/ReflectionResolver/ReflectionResolver/ExtensionMethodReflectionResolver.php b/src/ReflectionResolver/ReflectionResolver/ExtensionMethodReflectionResolver.php
index 776cbf7..818d5e4 100644
--- a/src/ReflectionResolver/ReflectionResolver/ExtensionMethodReflectionResolver.php
+++ b/src/ReflectionResolver/ReflectionResolver/ExtensionMethodReflectionResolver.php
@@ -50,7 +50,7 @@ public function resolve(ClassReflection $classReflection): array
         }
 
         /** @var array<class-string|null> $extensions */
-        $extensions = array_unique($extensions);
+        $extensions = array_unique($extensions); // @phpstan-ignore argument.type
 
         foreach ($extensions as $extension) {
             if ($extension === null) {
diff --git a/src/Rule/StaticCall/RequireInjectableCreateToMatchConstructorSignatureRule.php b/src/Rule/StaticCall/RequireInjectableCreateToMatchConstructorSignatureRule.php
index b1c6de9..82c614a 100644
--- a/src/Rule/StaticCall/RequireInjectableCreateToMatchConstructorSignatureRule.php
+++ b/src/Rule/StaticCall/RequireInjectableCreateToMatchConstructorSignatureRule.php
@@ -102,6 +102,10 @@ public function processNode(Node $node, Scope $scope): array
             'Return type of call to method ' . $methodName . ' contains unresolvable type.',
             '%s of method ' . $methodName . ' contains unresolvable type.',
             'Method ' . $methodName . " invoked with %s, but it's not allowed because of @no-named-arguments.",
+            'Constant %s is not allowed for %s of method ' . $methodName . ' constructor.',
+            'Constants %s cannot be combined for %s of method ' . $methodName . ' constructor.',
+            'Combining constants with | is not allowed for %s of method ' . $methodName . ' constructor.',
+            null,
         );
     }
 }