diff --git a/composer.json b/composer.json
index 0f40df58..b447f97d 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
         "symfony/asset": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
         "symfony/finder": "~3.4|~4.0",
-        "symfony/form": "^4.3",
+        "symfony/form": "^4.3.4",
         "symfony/http-foundation": "~4.3",
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/mime": "~4.3",