diff --git a/packages/frontend/tsconfig.json b/packages/frontend/tsconfig.json
index 86109f600a428a567120c4c66befd82a91a594aa..54e5219b56bb47b012c92c8825153f90b51a5ac8 100644
--- a/packages/frontend/tsconfig.json
+++ b/packages/frontend/tsconfig.json
@@ -9,7 +9,7 @@
 		"noFallthroughCasesInSwitch": true,
 		"declaration": false,
 		"sourceMap": false,
-		"target": "es2017",
+		"target": "es2021",
 		"module": "esnext",
 		"moduleResolution": "node",
 		"removeComments": false,
diff --git a/packages/frontend/vite.config.ts b/packages/frontend/vite.config.ts
index 1acf5301b7a87f436db1e6dcc1dac109536723ec..80f50b6cfb32aa7a9425c1e22f0ab4cf2496c41a 100644
--- a/packages/frontend/vite.config.ts
+++ b/packages/frontend/vite.config.ts
@@ -8,7 +8,6 @@ import pluginJson5 from './vite.json5';
 const extensions = ['.ts', '.tsx', '.js', '.jsx', '.mjs', '.json', '.json5', '.svg', '.sass', '.scss', '.css', '.vue'];
 
 export default defineConfig(({ command, mode }) => {
-
 	return {
 		base: '/vite/',
 
@@ -46,7 +45,6 @@ export default defineConfig(({ command, mode }) => {
 				'chrome100',
 				'firefox100',
 				'safari15',
-				'es2017', // TODO: そのうち消す
 			],
 			manifest: 'manifest.json',
 			rollupOptions: {
diff --git a/packages/sw/tsconfig.json b/packages/sw/tsconfig.json
index c3a845f12a82bba1cba9784bc6ee9e3401043157..750aeff969fcb6cf5ea497f825a9c3e3541e8181 100644
--- a/packages/sw/tsconfig.json
+++ b/packages/sw/tsconfig.json
@@ -9,7 +9,7 @@
 		"noFallthroughCasesInSwitch": true,
 		"declaration": false,
 		"sourceMap": false,
-		"target": "es2017",
+		"target": "es2021",
 		"module": "esnext",
 		"moduleResolution": "node",
 		"removeComments": false,