diff --git a/src/Symfony/Component/Serializer/composer.json b/src/Symfony/Component/Serializer/composer.json
index cf48812e1ebf..a28d18fe4e26 100644
--- a/src/Symfony/Component/Serializer/composer.json
+++ b/src/Symfony/Component/Serializer/composer.json
@@ -28,6 +28,7 @@
         "symfony/dependency-injection": "^3.4|^4.0|^5.0",
         "symfony/error-handler": "^4.4|^5.0",
         "symfony/http-foundation": "^3.4|^4.0|^5.0",
+        "symfony/mime": "^4.4|^5.0",
         "symfony/property-access": "^3.4|^4.0|^5.0",
         "symfony/property-info": "^3.4.13|~4.0|^5.0",
         "symfony/validator": "^3.4|^4.0|^5.0",
diff --git a/src/Symfony/Component/Validator/composer.json b/src/Symfony/Component/Validator/composer.json
index fec833702d20..230dfab8e222 100644
--- a/src/Symfony/Component/Validator/composer.json
+++ b/src/Symfony/Component/Validator/composer.json
@@ -31,6 +31,7 @@
         "symfony/dependency-injection": "^3.4|^4.0|^5.0",
         "symfony/expression-language": "^3.4|^4.0|^5.0",
         "symfony/cache": "^3.4|^4.0|^5.0",
+        "symfony/mime": "^4.4|^5.0",
         "symfony/property-access": "^3.4|^4.0|^5.0",
         "symfony/property-info": "^3.4|^4.0|^5.0",
         "symfony/translation": "^4.2",