diff --git a/composer.json-dist b/composer.json-dist
index 465d2e856..e29976c52 100644
--- a/composer.json-dist
+++ b/composer.json-dist
@@ -26,7 +26,7 @@
         "endroid/qrcode": "~1.6.5"
     },
     "require-dev": {
-        "phpunit/phpunit": "~5.7.15"
+        "phpunit/phpunit": "^4.8.36 || ^5.7.15"
     },
     "suggest": {
         "pear/net_ldap2": "~2.2.0 required for connecting to LDAP",