diff --git a/src/Illuminate/Pipeline/composer.json b/src/Illuminate/Pipeline/composer.json
index a5c9e57565f8..68d30a44dcdf 100644
--- a/src/Illuminate/Pipeline/composer.json
+++ b/src/Illuminate/Pipeline/composer.json
@@ -17,7 +17,7 @@
         "php": "^7.2",
         "illuminate/contracts": "^6.0",
         "illuminate/support": "^6.0",
-        "symfony/debug": "^4.3"
+        "symfony/debug": "^4.3.4"
     },
     "autoload": {
         "psr-4": {