diff --git a/src/Symfony/Component/Form/composer.json b/src/Symfony/Component/Form/composer.json
index 1febae6c88..c9a4f63edf 100644
--- a/src/Symfony/Component/Form/composer.json
+++ b/src/Symfony/Component/Form/composer.json
@@ -36,6 +36,7 @@
     },
     "conflict": {
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
+        "symfony/dependency-injection": "<3.2",
         "symfony/doctrine-bridge": "<2.7",
         "symfony/framework-bundle": "<2.7",
         "symfony/twig-bridge": "<2.7"
diff --git a/src/Symfony/Component/Serializer/composer.json b/src/Symfony/Component/Serializer/composer.json
index e4259acb5b..dc1017d5b4 100644
--- a/src/Symfony/Component/Serializer/composer.json
+++ b/src/Symfony/Component/Serializer/composer.json
@@ -31,6 +31,7 @@
         "phpdocumentor/reflection-docblock": "~3.0"
     },
     "conflict": {
+        "symfony/dependency-injection": "<3.2",
         "symfony/property-access": ">=3.0,<3.0.4|>=2.8,<2.8.4",
         "symfony/property-info": "<3.1",
         "symfony/yaml": "<3.1"