diff --git a/composer.json b/composer.json
index 6c2363d..816d3a7 100644
--- a/composer.json
+++ b/composer.json
@@ -9,10 +9,10 @@
     "require": {
         "php": ">=7.1",
         "pomm-project/foundation": "~2.0",
-        "symfony/http-foundation": "~4.0|~5.0",
-        "symfony/http-kernel": "~4.4|~5.0",
-        "symfony/serializer": "~4.0|~5.0",
-        "symfony/property-info": "~4.0|~5.0"
+        "symfony/http-foundation": "~3.0|~4.0|~5.0",
+        "symfony/http-kernel": "~3.0|~4.0|~5.0",
+        "symfony/serializer": "~3.0|~4.0|~5.0",
+        "symfony/property-info": "~3.0|~4.0|~5.0"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "~2.7"
@@ -20,7 +20,8 @@
     "suggest": {
         "pomm-project/model-manager": "~2.0",
         "pomm-project/cli": "~2.0",
-        "symfony/symfony": "~4.4|~5.0"
+        "silex/silex": "~1.0",
+        "symfony/symfony": "~3.0|~4.0|~5.0"
     },
     "autoload": {
         "psr-4": {