diff --git a/packages/docusaurus-plugin-content-blog/src/index.ts b/packages/docusaurus-plugin-content-blog/src/index.ts
index 17d8c0de1ece..6dd807a524d0 100644
--- a/packages/docusaurus-plugin-content-blog/src/index.ts
+++ b/packages/docusaurus-plugin-content-blog/src/index.ts
@@ -441,7 +441,7 @@ export default function pluginContentBlog(
       const feedTypes = getFeedTypes(options.feedOptions?.type);
 
       await Promise.all(
-        feedTypes.map((feedType) => {
+        feedTypes.map(async (feedType) => {
           const feedPath = path.join(
             outDir,
             options.routeBasePath,
@@ -449,7 +449,7 @@ export default function pluginContentBlog(
           );
           const feedContent = feedType === 'rss' ? feed.rss2() : feed.atom1();
           try {
-            fs.writeFileSync(feedPath, feedContent);
+            await fs.outputFile(feedPath, feedContent);
           } catch (err) {
             throw new Error(`Generating ${feedType} feed failed: ${err}`);
           }
diff --git a/packages/docusaurus-plugin-sitemap/src/index.ts b/packages/docusaurus-plugin-sitemap/src/index.ts
index 003f34587b18..b7a5acf75f5a 100644
--- a/packages/docusaurus-plugin-sitemap/src/index.ts
+++ b/packages/docusaurus-plugin-sitemap/src/index.ts
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import fs from 'fs';
+import fs from 'fs-extra';
 import path from 'path';
 import {PluginOptions} from './types';
 import createSitemap from './createSitemap';
@@ -37,7 +37,7 @@ export default function pluginSitemap(
       // Write sitemap file.
       const sitemapPath = path.join(outDir, 'sitemap.xml');
       try {
-        fs.writeFileSync(sitemapPath, generatedSitemap);
+        await fs.outputFile(sitemapPath, generatedSitemap);
       } catch (err) {
         throw new Error(`Sitemap error: ${err}`);
       }