diff --git a/lua/pantran/engines/deepl.lua b/lua/pantran/engines/deepl.lua
index 916a5a3..f794503 100644
--- a/lua/pantran/engines/deepl.lua
+++ b/lua/pantran/engines/deepl.lua
@@ -76,7 +76,9 @@ function deepl.setup()
   deepl._api = curl.new{
     url = deepl.url_template:format(deepl.config.free_api and "-free" or ""),
     fmt_error = function(response) return response.message end,
-    data = {auth_key = deepl.config.auth_key},
+    headers = {
+      Authorization = 'DeepL-Auth-Key ' .. deepl.config.auth_key,
+    },
     static_paths = {"languages"}
   }
   if not deepl.config.auth_key then