diff --git a/public/manifest.json b/public/manifest.json
index b532d3f..4beba6e 100644
--- a/public/manifest.json
+++ b/public/manifest.json
@@ -10,21 +10,21 @@
   "categories": ["utilities", "productivity"],
   "icons": [
     {
-      "src": "/icon-192.png",
+      "src": "/icon-192.svg",
       "sizes": "192x192",
-      "type": "image/png",
+      "type": "image/svg+xml",
       "purpose": "any maskable"
     },
     {
-      "src": "/icon-512.png",
+      "src": "/icon-512.svg",
       "sizes": "512x512",
-      "type": "image/png",
+      "type": "image/svg+xml",
       "purpose": "any maskable"
     },
     {
-      "src": "/icon-512.png",
+      "src": "/icon-512.svg",
       "sizes": "512x512",
-      "type": "image/png",
+      "type": "image/svg+xml",
       "purpose": "maskable"
     }
   ]
diff --git a/public/sw.js b/public/sw.js
index 69d4912..caff2c4 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -1,4 +1,4 @@
-/* ── IPFS Portal — Service Worker v2 ──
+/* ── IPFS Portal — Service Worker v3 ──
  *
  * Cache strategieën per route type:
  *   - Precache: app shell (alle pages)
@@ -7,9 +7,9 @@
  *   - Stale-while-revalidate: navigatie requests
  */
 
-const CACHE = 'ipfs-portal-v2';
-const STATIC_CACHE = 'ipfs-portal-static-v2';
-const DATA_CACHE = 'ipfs-portal-data-v2';
+const CACHE = 'ipfs-portal-v3';
+const STATIC_CACHE = 'ipfs-portal-static-v3';
+const DATA_CACHE = 'ipfs-portal-data-v3';
 
 const PRECACHE_URLS = [
   '/',
@@ -103,7 +103,8 @@ async function cacheFirst(request, cacheName) {
   if (cached) return cached;
   try {
     const response = await fetch(request);
-    if (response.ok) {
+    // Cache API supports GET/HEAD only
+    if (response.ok && request.method === 'GET') {
       const cache = await caches.open(cacheName);
       cache.put(request, response.clone());
     }
@@ -116,7 +117,8 @@ async function cacheFirst(request, cacheName) {
 async function networkFirst(request, cacheName) {
   try {
     const response = await fetch(request);
-    if (response.ok) {
+    // Cache API supports GET/HEAD only — POST/PUT/DELETE must be skipped
+    if (response.ok && request.method === 'GET') {
       const cache = await caches.open(cacheName);
       cache.put(request, response.clone());
     }
@@ -134,7 +136,7 @@ async function staleWhileRevalidate(request, cacheName) {
 
   const fetchPromise = fetch(request)
     .then((response) => {
-      if (response.ok) cache.put(request, response.clone());
+      if (response.ok && request.method === 'GET') cache.put(request, response.clone());
       return response;
     })
     .catch(() => cached);