diff --git a/composer.json b/composer.json
index e3f0bb53..94363dd1 100644
--- a/composer.json
+++ b/composer.json
@@ -40,7 +40,7 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^8.5",
+        "phpunit/phpunit": "^8.5 || ^7.5",
         "smarty/smarty-lexer": "^3.1"
     }
 }