diff --git a/composer.json b/composer.json
index 4eeb213..31cc149 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "require-dev": {
         "nette/tester": "2.4.3",
         "mockery/mockery": "1.5.1",
-        "phpstan/phpstan": "1.8.6",
+        "phpstan/phpstan": "1.8.9",
         "phpstan/phpstan-strict-rules": "1.4.4",
         "phpstan/phpstan-nette": "1.1.0",
         "phpstan/phpstan-mockery": "1.1.0",