diff --git a/src/Symfony/Component/Routing/composer.json b/src/Symfony/Component/Routing/composer.json
index 2ad746ec53..4d820cc213 100644
--- a/src/Symfony/Component/Routing/composer.json
+++ b/src/Symfony/Component/Routing/composer.json
@@ -19,7 +19,7 @@
         "php": "^5.5.9|>=7.0.8"
     },
     "require-dev": {
-        "symfony/config": "~2.8|~3.0|~4.0",
+        "symfony/config": "^3.3.1|~4.0",
         "symfony/http-foundation": "~2.8|~3.0|~4.0",
         "symfony/yaml": "~3.4|~4.0",
         "symfony/expression-language": "~2.8|~3.0|~4.0",
@@ -29,7 +29,7 @@
         "psr/log": "~1.0"
     },
     "conflict": {
-        "symfony/config": "<2.8",
+        "symfony/config": "<3.3.1",
         "symfony/dependency-injection": "<3.3",
         "symfony/yaml": "<3.4"
     },