diff --git a/composer.json b/composer.json
index 97ae12b..8f85284 100644
--- a/composer.json
+++ b/composer.json
@@ -19,7 +19,7 @@
         "symfony/cache": "^3.3 || ^4.3",
         "symfony/http-foundation": "^2.7 || ^3.0 || ^4.0",
         "symfony/psr-http-message-bridge": "^0.3 || ^1.0",
-        "symfony/event-dispatcher": "^5.0",
+        "symfony/event-dispatcher": "^4.3",
         "monolog/monolog": "^1.22 || ^2.0",
         "psr/simple-cache": "^1.0"
     },