diff --git a/phpstan.neon b/phpstan.neon
index 63ba4763..687d6cac 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -3,7 +3,7 @@ includes:
 	- phpstan-conditional.php
 parameters:
 	tmpDir: %currentWorkingDirectory%/tmp/phpstan-corelibs
-	level: 8 # max is now 9
+	level: 9 # max is now 9
 	checkMissingCallableSignature: true
 	treatPhpDocTypesAsCertain: false
 	strictRules: