diff --git a/serviceworker.js b/serviceworker.js
deleted file mode 100644
index 3c5184b..0000000
--- a/serviceworker.js
+++ /dev/null
@@ -1,39 +0,0 @@
-var cacheName = 'takarasagashi-2025-1223';
-var filesToCache = [
-    './',
-    './loc-chase2.html',
-    './loc-chase2.js',
-    './pwa-sample-192.png',
-    './pwa-sample.ico',
-];
-self.addEventListener('install', function(event) {
-    console.log('ServiceWorker installing');
-    event.waitUntil(
-	caches.open(cacheName).then(function(cache) {
-	    console.log('Service Worker caching app shell');
-	    return cache.addAll(filesToCache);
-	})
-    );
-});
-self.addEventListener('activate', function(event) {
-    console.log('Service Worker activating');
-    event.waitUntil(
-	caches.keys().then(function(keyList) {
-	    return Promise.all(keyList.map(function(key) {
-		if (key !== cacheName) {
-		    console.log('Service Worker removing old cache', key);
-		    return caches.delete(key);
-		}
-	    }));
-	})
-    );
-    return self.clients.claim();
-});
-self.addEventListener('fetch', function(event) {
-    console.log('Service Worker fetching', event.request.url);
-    event.respondWith(
-	caches.match(event.request).then(function(response) {
-	    return response || fetch(event.request);
-	})
-    );
-});