diff --git a/composer.json b/composer.json
index 53d66d7f2..db7788305 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
     "nyholm/psr7": "^1.5",
     "phpbench/phpbench": "^1.2",
     "phpstan/extension-installer": "^1.1",
-    "phpstan/phpstan": "2.0.0",
+    "phpstan/phpstan": "1.12.9",
     "phpstan/phpstan-phpunit": "1.4.0",
     "phpstan/phpstan-strict-rules": "1.6.1",
     "phpunit/phpunit": "^9.5 || ^10.5.21 || ^11",