diff --git a/backend/requirements.txt b/backend/requirements.txt
index 4a481cc..a4ed098 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -1,3 +1,4 @@
 fastapi>=0.115,<1.0
 uvicorn[standard]>=0.34,<1.0
+gunicorn>=23,<24; sys_platform != "win32"
 httpx>=0.28,<1.0