diff --git a/src/Symfony/Bridge/Doctrine/composer.json b/src/Symfony/Bridge/Doctrine/composer.json
index 29c2e1cc8c..ed5df1d368 100644
--- a/src/Symfony/Bridge/Doctrine/composer.json
+++ b/src/Symfony/Bridge/Doctrine/composer.json
@@ -33,6 +33,9 @@
         "doctrine/dbal": "~2.4",
         "doctrine/orm": "^2.4.5"
     },
+    "conflict": {
+        "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0"
+    },
     "suggest": {
         "symfony/form": "",
         "symfony/validator": "",
diff --git a/src/Symfony/Bundle/FrameworkBundle/composer.json b/src/Symfony/Bundle/FrameworkBundle/composer.json
index 1a479551d6..20f4d306ba 100644
--- a/src/Symfony/Bundle/FrameworkBundle/composer.json
+++ b/src/Symfony/Bundle/FrameworkBundle/composer.json
@@ -48,6 +48,9 @@
         "symfony/yaml": "^2.0.5",
         "sensio/framework-extra-bundle": "^3.0.2"
     },
+    "conflict": {
+        "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0"
+    },
     "suggest": {
         "symfony/console": "For using the console commands",
         "symfony/form": "For using forms",
diff --git a/src/Symfony/Component/Form/composer.json b/src/Symfony/Component/Form/composer.json
index e0c354db64..f50f893e73 100644
--- a/src/Symfony/Component/Form/composer.json
+++ b/src/Symfony/Component/Form/composer.json
@@ -31,6 +31,7 @@
         "symfony/translation": "^2.0.5"
     },
     "conflict": {
+        "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
         "symfony/doctrine-bridge": "<2.7",
         "symfony/framework-bundle": "<2.7",
         "symfony/twig-bridge": "<2.7"
diff --git a/src/Symfony/Component/VarDumper/composer.json b/src/Symfony/Component/VarDumper/composer.json
index 422e13c087..5a4a99e504 100644
--- a/src/Symfony/Component/VarDumper/composer.json
+++ b/src/Symfony/Component/VarDumper/composer.json
@@ -18,6 +18,9 @@
     "require": {
         "php": ">=5.3.9"
     },
+    "conflict": {
+        "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0"
+    },
     "suggest": {
         "ext-symfony_debug": ""
     },