diff --git a/composer.json b/composer.json
index 02a77ab..318f710 100644
--- a/composer.json
+++ b/composer.json
@@ -42,7 +42,7 @@
     "php-http/psr7-integration-tests": "dev-master",
     "phpspec/prophecy": "^1.15",
     "phpspec/prophecy-phpunit": "^2.0",
-    "phpstan/phpstan": "^1.7",
+    "phpstan/phpstan": "^1.8",
     "phpunit/phpunit": "^9.5",
     "squizlabs/php_codesniffer": "^3.7"
   },