diff --git a/composer.json b/composer.json
index bfa6f76..de9438e 100644
--- a/composer.json
+++ b/composer.json
@@ -17,7 +17,7 @@
   "require-dev": {
     "symfony/var-dumper": "^4.0",
     "tedivm/stash": "^0.14.2",
-    "symfony/yaml": "^4.3",
+    "symfony/yaml": "^5.0",
     "bavix/tests": "^1.0"
   },
   "autoload": {