diff --git a/system/public/aesthetic.computer/bios.mjs b/system/public/aesthetic.computer/bios.mjs
index 5a9d63a809..002de39809 100644
--- a/system/public/aesthetic.computer/bios.mjs
+++ b/system/public/aesthetic.computer/bios.mjs
@@ -5963,6 +5963,19 @@ async function boot(parsed, bpm = 60, resolution, debug) {
       return;
     }
 
+    if (type === "sw:clear-cache") {
+      // Forwarded from prompt.mjs's deployment poll. Tell the active SW
+      // to drop its module cache so the next page load fetches fresh
+      // bios.mjs / disk.mjs etc. instead of stale-while-revalidating.
+      try {
+        navigator.serviceWorker?.controller?.postMessage("clearCache");
+        console.log("🔧 Main thread: requested SW cache clear");
+      } catch (e) {
+        console.warn("🔧 Could not post clearCache to SW:", e);
+      }
+      return;
+    }
+
     // Helper function to ensure fonts are loaded before use
     let fontsLoaded = false;
     async function ensureFontsLoaded() {
diff --git a/system/public/aesthetic.computer/disks/prompt.mjs b/system/public/aesthetic.computer/disks/prompt.mjs
index ce9645f136..fde3f7eae5 100644
--- a/system/public/aesthetic.computer/disks/prompt.mjs
+++ b/system/public/aesthetic.computer/disks/prompt.mjs
@@ -822,6 +822,19 @@ async function boot({
           recentCommits = data.recentCommits || [];
           needsPaint();
           console.log("📦 New deployment detected:", data.deployed);
+          // Tell the active service worker (via the main thread, since we
+          // run inside a Web Worker and don't have direct access to
+          // navigator.serviceWorker) to evict its module cache. The
+          // user's NEXT navigation/reload then pulls fresh bios.mjs +
+          // disk.mjs instead of stale-while-revalidating for up to an
+          // hour. We don't auto-reload here — that would interrupt the
+          // user mid-task — but the cache eviction makes a manual
+          // reload propagate the new build immediately.
+          try {
+            send({ type: "sw:clear-cache" });
+          } catch (e) {
+            console.warn("📦 Could not request SW cache clear:", e);
+          }
           break; // Stop polling — update is available
         } catch (e) {
           if (e.name === "AbortError") break;