diff --git a/decnet/templates/elasticsearch/server.py b/decnet/templates/elasticsearch/server.py
index 7d2b0d75..6f18c48d 100644
--- a/decnet/templates/elasticsearch/server.py
+++ b/decnet/templates/elasticsearch/server.py
@@ -94,7 +94,7 @@ class ESHandler(BaseHTTPRequestHandler):
     server_version = "elasticsearch"
     sys_version = ""
 
-    def _send_json(self, code: int, data: dict) -> None:
+    def _send_json(self, code: int, data: dict | list) -> None:
         body = json.dumps(data).encode()
         self.send_response(code)
         self.send_header("Content-Type", "application/json; charset=UTF-8")