diff --git a/composer.json b/composer.json
index 3b06ec0..7889eb7 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "hashids/hashids": "~2.0 || ~3.0 || ~4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~6.0 || ~7.0",
+        "phpunit/phpunit": "~6.0 || ~7.0 || ~12.0",
         "doctrine/dbal": "~2.0"
     },
     "autoload": {