diff --git a/composer.json b/composer.json
index 21010c671d..45b4f902ca 100644
--- a/composer.json
+++ b/composer.json
@@ -78,7 +78,7 @@
         "samyoul/u2f-php-server": "For FIDO U2F authentication"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.1",
+        "phpunit/phpunit": "^4.8.36 || ^5.7",
         "codacy/coverage": "^1.3.0",
         "phpunit/phpunit-selenium": "~1.2",
         "squizlabs/php_codesniffer": "^3.0",