diff --git a/samples/server/petstore/python-fastapi/requirements.txt b/samples/server/petstore/python-fastapi/requirements.txt
index 9eb2e18a44da..256baa938cd3 100644
--- a/samples/server/petstore/python-fastapi/requirements.txt
+++ b/samples/server/petstore/python-fastapi/requirements.txt
@@ -28,7 +28,7 @@ requests==2.32.4
 Rx==1.6.1
 starlette==0.49.1
 typing-extensions==4.13.2
-ujson==4.0.2
+ujson==5.12.0
 urllib3==2.7.0
 uvicorn==0.13.4
 uvloop==0.21.0