diff --git a/composer.json b/composer.json
index d0a9a5e..3437d1c 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
         "psr/http-message": "^1.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "7.5.4",
+        "phpunit/phpunit": "7.5.6",
         "php-http/psr7-integration-tests": "dev-master"
     },
     "provide": {