diff --git a/composer.json b/composer.json
index 046c8ca..d9001cd 100644
--- a/composer.json
+++ b/composer.json
@@ -15,7 +15,7 @@
 		"psr/http-message": "^1.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "7.4.3"
+		"phpunit/phpunit": "7.5.1"
 	},
 	"provide": {
 		"psr/http-message-implementation": "1.0"