diff --git a/articles/2024-11-30-gemfile.md b/articles/2024-11-30-gemfile.md
index e037b87c008..19f1fe8e608 100644
--- a/articles/2024-11-30-gemfile.md
+++ b/articles/2024-11-30-gemfile.md
@@ -165,7 +165,7 @@ updates:
       - dependabot-bundler
 ```
 
-### gem groupを分ける
+## gem groupを分ける
 
 独立して使われるgemは別のgem groupに分ける。