diff --git a/composer.json b/composer.json
index 2192d81..e0b0ae0 100644
--- a/composer.json
+++ b/composer.json
@@ -10,11 +10,11 @@
     ],
     "require": {
         "php": ">=8.0",
-        "guzzlehttp/psr7": "^2.0",
+        "guzzlehttp/psr7": "^2.5",
         "zbateson/mb-wrapper": "^2.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "<10.0",
+        "phpunit/phpunit": "^9.6|^10.0",
         "friendsofphp/php-cs-fixer": "*",
         "phpstan/phpstan": "*"
     },