diff --git a/packages/gitbook/src/components/DocumentView/CodeBlock/highlight.ts b/packages/gitbook/src/components/DocumentView/CodeBlock/highlight.ts
index 0456809a62..eb02b5b928 100644
--- a/packages/gitbook/src/components/DocumentView/CodeBlock/highlight.ts
+++ b/packages/gitbook/src/components/DocumentView/CodeBlock/highlight.ts
@@ -39,7 +39,7 @@ const { getSingletonHighlighter } = createSingletonShorthands(
     createdBundledHighlighter<any, any>({
         langs: bundledLanguages,
         themes: {},
-        engine: () => createJavaScriptRegexEngine({ forgiving: true, target: 'ES2024' }),
+        engine: () => createJavaScriptRegexEngine({ forgiving: true, target: 'ES2018' }),
     })
 );