diff --git a/composer.json b/composer.json
index 8171e6e..57be6cd 100644
--- a/composer.json
+++ b/composer.json
@@ -16,11 +16,11 @@
         }
     },
     "require": {
-        "symfony/http-foundation": "^3.0",
-        "symfony/http-kernel": "^3.0",
-        "symfony/serializer": "^3.0",
+        "symfony/http-foundation": "^3.0|^4.0",
+        "symfony/http-kernel": "^3.0|^4.0",
+        "symfony/serializer": "^3.0|^4.0",
         "doctrine/annotations": "^1.0",
-        "symfony/validator": "^3.0"
+        "symfony/validator": "^3.0|^4.0"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "^3.0",