diff --git a/composer.json b/composer.json
index ff78d12..069141e 100644
--- a/composer.json
+++ b/composer.json
@@ -31,7 +31,7 @@
         "twig/twig":  "^2.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^6.0"
+        "phpunit/phpunit": "^6.5 || ^7.5"
     },
     "bin": ["bin/phint"],
     "config": {