diff --git a/composer.json b/composer.json
index dc8199d..a818ab0 100644
--- a/composer.json
+++ b/composer.json
@@ -20,7 +20,9 @@
         "php": ">=5.3.2",
         "behat/behat": "2.4@stable",
         "behat/mink": "1.4@stable",
-        "behat/mink-extension": "1.0@stable"
+        "behat/mink-extension": "1.0@stable",
+        "behat/mink-selenium2-driver": "*",
+        "behat/mink-goutte-driver": "*"
     },
 
     "autoload": {
@@ -28,4 +30,4 @@
             "SilverStripe\\BehatExtension": "src/"
         }
     }
-}
\ No newline at end of file
+}