1 files changed, 1 insertions, 1 deletions
diff --git a/composer.json b/composer.json
index 884ddb6..ff0590f 100644
--- a/composer.json
+++ b/composer.json
@@ -32,7 +32,7 @@
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "~2.5",
-        "phpunit/phpunit": ">=4.8.36",
+        "phpunit/phpunit": "^5.7 || ^6.5 || ^7.5 || ^8.3",
         "twbs/bootstrap": "~4.3",
         "zurb/foundation": "~6.5"
     },