diff --git a/composer.json b/composer.json
index 8711471..76601a4 100644
--- a/composer.json
+++ b/composer.json
@@ -11,7 +11,10 @@
     ],
     "require": {
         "php": "^7.1.3",
-        "doctrine/orm": "^2.5"
+        "doctrine/orm": "^2.5",
+        "symfony/config": "^3.4 || ^4.0 || ^5.0",
+        "symfony/dependency-injection": "^3.4 || ^4.1.12 || ^5.0",
+        "symfony/http-kernel": "^3.4 || ^4.0 || ^5.0"
     },
     "require-dev": {
         "symfony/phpunit-bridge": "^3.4 || ^4.1.12 || ^5.0"