diff --git a/composer.json b/composer.json
index 30266b3..8c15af5 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
   "require-dev": {
     "psr/http-message": "^1.0",
     "erusev/parsedown-extra": "^0.7.1",
-    "phpunit/phpunit": "^7.4"
+    "phpunit/phpunit": "*"
   },
   "suggest": {
     "erusev/parsedown-extra": "required to use markdown() methods"