diff --git a/.changeset/twelve-donuts-hide.md b/.changeset/twelve-donuts-hide.md
new file mode 100644
index 0000000000..504d1b5bea
--- /dev/null
+++ b/.changeset/twelve-donuts-hide.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+"Added `inert` to htmlBooleanAttributes"
diff --git a/packages/astro/src/runtime/server/render/util.ts b/packages/astro/src/runtime/server/render/util.ts
index 9c771a0de0..d693ad070f 100644
--- a/packages/astro/src/runtime/server/render/util.ts
+++ b/packages/astro/src/runtime/server/render/util.ts
@@ -7,7 +7,7 @@ import { HTMLString, markHTMLString } from '../escape.js';
 export const voidElementNames =
 	/^(area|base|br|col|command|embed|hr|img|input|keygen|link|meta|param|source|track|wbr)$/i;
 const htmlBooleanAttributes =
-	/^(?:allowfullscreen|async|autofocus|autoplay|checked|controls|default|defer|disabled|disablepictureinpicture|disableremoteplayback|formnovalidate|hidden|loop|nomodule|novalidate|open|playsinline|readonly|required|reversed|scoped|seamless|selected|itemscope)$/i;
+	/^(?:allowfullscreen|async|autofocus|autoplay|checked|controls|default|defer|disabled|disablepictureinpicture|disableremoteplayback|formnovalidate|hidden|inert|loop|nomodule|novalidate|open|playsinline|readonly|required|reversed|scoped|seamless|selected|itemscope)$/i;
 
 const AMPERSAND_REGEX = /&/g;
 const DOUBLE_QUOTE_REGEX = /"/g;