diff --git a/backend/config.py b/backend/config.py
index 12af111..6d0a199 100644
--- a/backend/config.py
+++ b/backend/config.py
@@ -42,7 +42,7 @@ proxy_server = os.environ.get("PROXY_SERVER")
 
 
 class ProxyCreateLink(pydantic.BaseModel):
-    upstream: pydantic.HttpUrl
+    upstream: Optional[pydantic.HttpUrl]
     ctype: Optional[pydantic.StrictStr]
     region: Optional[pydantic.StrictStr]