diff --git a/composer.json b/composer.json
index 019944e..d5f4a77 100644
--- a/composer.json
+++ b/composer.json
@@ -6,7 +6,7 @@
   "require": {
     "php": ">=8.1",
     "codeigniter4/framework": "^4.0",
-    "league/oauth2-server": "^8.1",
+    "league/oauth2-server": "^9.0",
     "laminas/laminas-diactoros": "^3.3.1",
     "steverhoades/oauth2-openid-connect-server": "^2.0"
   },