diff --git a/lib/server/imageGenerator.js b/lib/server/imageGenerator.js
index 9b36841..fb874ff 100644
--- a/lib/server/imageGenerator.js
+++ b/lib/server/imageGenerator.js
@@ -29,8 +29,9 @@ class ImageGenerator {
         const absolutePath = path_1.default.join(this.outDir, imageName);
         const relativePath = path_1.default.join('/', this.args.dir, absolutePath.slice(this.outDir.length));
         const svg = await this.satori(element, options);
-        const pngBuffer = new resvg_js_1.Resvg(svg).render().asPng();
-        fs.writeFileSync(absolutePath, pngBuffer);
+        const resvg = new resvg_js_1.Resvg(svg);
+        const pngOutput = resvg.render();
+        await fsp.writeFile(absolutePath, pngOutput.asPng());
         const url = new URL(this.args.websiteUrl);
         url.pathname = relativePath;
         this.cache[hash] = {
diff --git a/src/server/imageGenerator.ts b/src/server/imageGenerator.ts
index 62d500e..8c48e1e 100644
--- a/src/server/imageGenerator.ts
+++ b/src/server/imageGenerator.ts
@@ -54,8 +54,9 @@ export class ImageGenerator {
     )
 
     const svg = await this.satori(element, options)
-    const pngBuffer = new Resvg(svg).render().asPng();
-    fs.writeFileSync(absolutePath, pngBuffer);
+    const resvg = new Resvg(svg);
+    const pngOutput = resvg.render();
+    await fsp.writeFile(absolutePath, pngOutput.asPng());
 
     const url = new URL(this.args.websiteUrl)
     url.pathname = relativePath