diff --git a/composer.json b/composer.json
index dda72f0..494eb0a 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
 		"php" : ">=5.3.0"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "~4.8|~9"
+		"phpunit/phpunit": "~4.8|~9|~11"
 	},
 	"autoload"   : {
 		"files": ["src/array.php"]