diff --git a/composer.json b/composer.json
index 2f1b5c2..b70571a 100644
--- a/composer.json
+++ b/composer.json
@@ -14,7 +14,7 @@
 		"php" : ">=5.4"
 	},
 	"require-dev": {
-		"phpunit/phpunit" : "^8.4.0"
+		"phpunit/phpunit" : "^9.0.1"
 	},
 	"autoload": {
 		"psr-4": {