diff --git a/docs/docs.json b/docs/docs.json
index ba75a038fc..53d47bc979 100644
--- a/docs/docs.json
+++ b/docs/docs.json
@@ -1274,7 +1274,7 @@
         ]
       },
       {
-        "language": "ja",
+        "language": "ja-jp",
         "tabs": [
           {
             "tab": "はじめに",