diff --git a/src/pages/html/03-javascript.mdx b/src/pages/html/03-javascript.mdx
deleted file mode 100644
index fbea73a..0000000
--- a/src/pages/html/03-javascript.mdx
+++ /dev/null
@@ -1,7 +0,0 @@
----
-layout: "@/layouts/MarkdownLayout.astro"
----
-
-export const title = "JavaScriptで動きをつける";
-
-# {title}
diff --git a/src/pages/html/04-javascript.mdx b/src/pages/html/04-javascript.mdx
new file mode 100644
index 0000000..fbea73a
--- /dev/null
+++ b/src/pages/html/04-javascript.mdx
@@ -0,0 +1,7 @@
+---
+layout: "@/layouts/MarkdownLayout.astro"
+---
+
+export const title = "JavaScriptで動きをつける";
+
+# {title}