diff --git a/composer.json b/composer.json
index dd60041..b0b931c 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=5.6",
+        "behat/mink-selenium2-driver": "dev-master as 1.3.x-dev",
         "composer/installers": "^1.2",
         "cweagans/composer-patches": "^1.6.5",
         "drupal-composer/drupal-scaffold": "^2.5",