diff --git a/composer.json b/composer.json
index a717d62..e52a70a 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
         "phpstan/phpstan-phpunit": "^0.11",
         "phpstan/phpstan-strict-rules": "^0.11",
         "phpunit/phpunit": "^8.2",
-        "zendframework/zend-diactoros": "^2.0"
+        "zendframework/zend-diactoros": "^2.1"
     },
     "autoload": {
         "psr-4": {