diff --git a/packages/protocol/package.json b/packages/protocol/package.json
index 8c8c30e..28d5f80 100644
--- a/packages/protocol/package.json
+++ b/packages/protocol/package.json
@@ -29,7 +29,7 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@asteasolutions/zod-to-openapi": "^8.5.0",
+    "@asteasolutions/zod-to-openapi": "^9.1.0",
     "zod": "^4.4.3"
   }
 }