diff --git a/composer.json b/composer.json
index d29a96a..6c2363d 100644
--- a/composer.json
+++ b/composer.json
@@ -9,10 +9,10 @@
     "require": {
         "php": ">=7.1",
         "pomm-project/foundation": "~2.0",
-        "symfony/http-foundation": "~2.5|~3.0|~4.0|~5.0",
-        "symfony/http-kernel": "~2.5|~3.0|~4.0|~5.0",
-        "symfony/serializer": "~2.5|~3.0|~4.0|~5.0",
-        "symfony/property-info": "~2.8|~3.0|~4.0|~5.0"
+        "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"
     },
     "require-dev": {
         "squizlabs/php_codesniffer": "~2.7"
@@ -20,8 +20,7 @@
     "suggest": {
         "pomm-project/model-manager": "~2.0",
         "pomm-project/cli": "~2.0",
-        "silex/silex": "~1.0",
-        "symfony/symfony": "~2.5|~3.0|~4.0|~5.0"
+        "symfony/symfony": "~4.4|~5.0"
     },
     "autoload": {
         "psr-4": {