diff --git a/composer.json b/composer.json
index 79fb7ec3..ae81bb72 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,7 @@
         "webmozart/assert": "^1.9"
     },
     "require-dev": {
-        "friendsofphp/php-cs-fixer": "^3.90",
+        "friendsofphp/php-cs-fixer": "^3.91",
         "mikey179/vfsstream": "^1.6",
         "phpspec/prophecy": "^1.10",
         "phpspec/prophecy-phpunit": "^2.4",