diff --git a/composer.json b/composer.json
index 8331bc8a1..a4606d71a 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,8 @@
         "react/promise": "^1.2 || ^2.7"
     },
     "conflict": {
-        "symfony/console": "2.8.38"
+        "symfony/console": "2.8.38",
+        "symfony/phpunit-bridge": "3.4.40"
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^3.4",