diff --git a/layouts/partials/header.html b/layouts/partials/header.html
index 73c6011..8f6ced6 100644
--- a/layouts/partials/header.html
+++ b/layouts/partials/header.html
@@ -1,5 +1,5 @@
 <!DOCTYPE html>
-<html lang="ja">
+<html lang="{{ .Site.LanguageCode }}">
 <head prefix="og: http://ogp.me/ns#">
   <meta charset="utf-8" />
   <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1" />
