diff --git a/src/Symfony/Component/HttpKernel/composer.json b/src/Symfony/Component/HttpKernel/composer.json
index 9ad3877ba1a5..f47f1162d1cd 100644
--- a/src/Symfony/Component/HttpKernel/composer.json
+++ b/src/Symfony/Component/HttpKernel/composer.json
@@ -19,7 +19,7 @@
         "php": "^5.5.9|>=7.0.8",
         "symfony/event-dispatcher": "~2.8|~3.0|~4.0",
         "symfony/http-foundation": "~3.4.12|~4.0.12|^4.1.1",
-        "symfony/debug": "~2.8|~3.0|~4.0",
+        "symfony/debug": "^3.3.3|~4.0",
         "symfony/polyfill-ctype": "~1.8",
         "psr/log": "~1.0"
     },