diff --git a/.changeset/new-starfishes-accept.md b/.changeset/new-starfishes-accept.md
new file mode 100644
index 00000000000..6b16f58b97c
--- /dev/null
+++ b/.changeset/new-starfishes-accept.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/starlight': patch
+---
+
+Fix timezone-reliance in LastUpdated
diff --git a/packages/starlight/components/LastUpdated.astro b/packages/starlight/components/LastUpdated.astro
index a4e70d51602..6e5fb8414cd 100644
--- a/packages/starlight/components/LastUpdated.astro
+++ b/packages/starlight/components/LastUpdated.astro
@@ -9,7 +9,7 @@ const { labels, lang, lastUpdated } = Astro.props;
 		<p>
 			{labels['page.lastUpdated']}{' '}
 			<time datetime={lastUpdated.toISOString()}>
-				{lastUpdated.toLocaleDateString(lang, { dateStyle: 'medium' })}
+				{lastUpdated.toLocaleDateString(lang, { dateStyle: 'medium', timeZone: 'UTC' })}
 			</time>
 		</p>
 	)