diff --git a/composer.json b/composer.json
index a99f77c..d1edc36 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
     "psr/simple-cache": "~1.0 || ~2.0"
   },
   "require-dev": {
-    "phpunit/phpunit": "~6.0 || ~7.0 || ~9.0"
+    "phpunit/phpunit": "~6.0 || ~7.0 || ~9.0 || ~12.0"
   },
   "suggest": {
     "symfony/var-exporter" : "~3.0 || ~4.0 || ~5.0 || ~6.0 || ~7.0",