diff --git a/composer.json b/composer.json
index 4ef8d4c..f8ec681 100644
--- a/composer.json
+++ b/composer.json
@@ -22,7 +22,7 @@
         "ext-session": "*",
         "ext-sockets": "*",
         "phpstan/extension-installer": "^1.3.1",
-        "phpstan/phpstan": "1.11.11",
+        "phpstan/phpstan": "1.12.0",
         "phpstan/phpstan-phpunit": "1.4.0",
         "phpunit/phpunit": "11.3.1",
         "psr/container": "^1.0 || ^2.0",
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index 56f60cd..048a17e 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -10,6 +10,11 @@ parameters:
 			count: 1
 			path: src/ReactPhpServer.php
 
+		-
+			message: "#^Offset 1 does not exist on array\\{0\\: string, 1\\?\\: numeric\\-string\\}\\.$#"
+			count: 1
+			path: src/Session/Reader/PhpReader.php
+
 		-
 			message: "#^Method BabDev\\\\WebSocket\\\\Server\\\\Session\\\\Reader\\\\PhpSerializeReader\\:\\:read\\(\\) should return array but returns mixed\\.$#"
 			count: 1