diff --git a/composer.json b/composer.json
index 258205a..03eeb7b 100644
--- a/composer.json
+++ b/composer.json
@@ -61,7 +61,7 @@
         "bin/md2resume"
     ],
     "require-dev": {
-        "phpunit/phpunit": "^6.2",
+        "phpunit/phpunit": "^6.2@dev",
         "squizlabs/php_codesniffer": "^3.0@dev",
         "jakub-onderka/php-parallel-lint": "dev-master",
         "jakub-onderka/php-console-highlighter": "dev-master"