diff --git a/packages/frontend-embed/src/workers/draw-blurhash.ts b/packages/frontend-embed/src/workers/draw-blurhash.ts
index 6e49f6bf66..0f97a525a8 100644
--- a/packages/frontend-embed/src/workers/draw-blurhash.ts
+++ b/packages/frontend-embed/src/workers/draw-blurhash.ts
@@ -3,6 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+/// <reference lib="esnext" />
+/// <reference lib="webworker" />
+
 import { render } from 'buraha';
 
 const canvas = new OffscreenCanvas(64, 64);
diff --git a/packages/frontend-embed/src/workers/test-webgl2.ts b/packages/frontend-embed/src/workers/test-webgl2.ts
index b203ebe666..aa512bd959 100644
--- a/packages/frontend-embed/src/workers/test-webgl2.ts
+++ b/packages/frontend-embed/src/workers/test-webgl2.ts
@@ -3,6 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+/// <reference lib="esnext" />
+/// <reference lib="webworker" />
+
 const canvas = globalThis.OffscreenCanvas && new OffscreenCanvas(1, 1);
 // 環境によってはOffscreenCanvasが存在しないため
 // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
diff --git a/packages/frontend/src/workers/draw-blurhash.ts b/packages/frontend/src/workers/draw-blurhash.ts
index 6e49f6bf66..0f97a525a8 100644
--- a/packages/frontend/src/workers/draw-blurhash.ts
+++ b/packages/frontend/src/workers/draw-blurhash.ts
@@ -3,6 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+/// <reference lib="esnext" />
+/// <reference lib="webworker" />
+
 import { render } from 'buraha';
 
 const canvas = new OffscreenCanvas(64, 64);
diff --git a/packages/frontend/src/workers/test-webgl2.ts b/packages/frontend/src/workers/test-webgl2.ts
index b203ebe666..aa512bd959 100644
--- a/packages/frontend/src/workers/test-webgl2.ts
+++ b/packages/frontend/src/workers/test-webgl2.ts
@@ -3,6 +3,9 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
+/// <reference lib="esnext" />
+/// <reference lib="webworker" />
+
 const canvas = globalThis.OffscreenCanvas && new OffscreenCanvas(1, 1);
 // 環境によってはOffscreenCanvasが存在しないため
 // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition