diff --git a/mcpgateway/services/gateway_service.py b/mcpgateway/services/gateway_service.py
index af8f9607e..67652c5ba 100644
--- a/mcpgateway/services/gateway_service.py
+++ b/mcpgateway/services/gateway_service.py
@@ -799,6 +799,20 @@ async def update_gateway(self, db: Session, gateway_id: str, gateway_update: Gat
                     gateway.transport = gateway_update.transport
                 if gateway_update.tags is not None:
                     gateway.tags = gateway_update.tags
+                if gateway_update.passthrough_headers is not None:
+                    if isinstance(gateway_update.passthrough_headers, list):
+                        gateway.passthrough_headers = gateway_update.passthrough_headers
+                    else:
+                        if isinstance(gateway_update.passthrough_headers, str):
+                            parsed = [h.strip() for h in gateway_update.passthrough_headers.split(",") if h.strip()]
+                            gateway.passthrough_headers = parsed
+                        else:
+                            raise GatewayError(
+                                "Invalid passthrough_headers format: must be list[str] or comma-separated string")
+
+                    logger.info(
+                        "Updated passthrough_headers for gateway {gateway.id}: {gateway.passthrough_headers}"
+                    )
 
                 if getattr(gateway, "auth_type", None) is not None:
                     gateway.auth_type = gateway_update.auth_type