diff --git a/functions/_middleware.js b/functions/_middleware.js
index 53f5ef3e..519c9f6b 100644
--- a/functions/_middleware.js
+++ b/functions/_middleware.js
@@ -12,7 +12,10 @@ export async function onRequest(context) {
   if (ASSET_EXTENSIONS.test(pathname) && isHtml) {
     return new Response(`Not found: ${pathname}`, {
       status: 404,
-      headers: { "Content-Type": "text/plain; charset=utf-8" },
+      headers: {
+        "Content-Type": "text/plain; charset=utf-8",
+        "Cache-Control": "no-store",
+      },
     });
   }
   return response;
diff --git a/package.json b/package.json
index e46e6429..34c5082e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "impro",
-  "version": "0.18.94",
+  "version": "0.18.95",
   "type": "module",
   "scripts": {
     "start": "rm -rf \"${BUILD_DIR:-build}\" && NODE_ENV=development eleventy --serve",