diff --git a/composer.json b/composer.json
index 9a0451ff..c1b517a9 100644
--- a/composer.json
+++ b/composer.json
@@ -57,7 +57,7 @@
     },
     "require-dev": {
         "phing/phing": "~2.7",
-        "phpunit/phpunit": "^4.8.35|^5.7|^6.0|^9.4",
+        "phpunit/phpunit": "^5.7|^6.0|^9.4",
         "squizlabs/php_codesniffer": "~2.0"
     },
     "suggest": {