diff --git a/package-lock.json b/package-lock.json
index 28bc8d8ee1648ac98d8b8cbccbcf1428afe8c2f3..ede7bee40e5d63f8dd43b597fbf7404e5ab8e930 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -7426,9 +7426,9 @@
       "dev": true
     },
     "uglify-js": {
-      "version": "3.6.5",
-      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.5.tgz",
-      "integrity": "sha512-7L3W+Npia1OCr5Blp4/Vw83tK1mu5gnoIURtT1fUVfQ3Kf8WStWV6NJz0fdoBJZls0KlweruRTLVe6XLafmy5g==",
+      "version": "3.6.6",
+      "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.6.6.tgz",
+      "integrity": "sha512-q3Zusqd028P8MdbarqL0I1snTZ7+IbIWiKUXVZyXMVdOSxOG2FFqLXyGlgYSqYu46SR7tR3Sk0xqN1VtvxGWnQ==",
       "dev": true,
       "optional": true,
       "requires": {
diff --git a/public/service-worker.js b/public/service-worker.js
index be725bebd63b8b8f74f3820ad44df5df929a242e..c520501577831b66abb2cbd7d0f63771eceba838 100644
--- a/public/service-worker.js
+++ b/public/service-worker.js
@@ -21,6 +21,9 @@ const FILES_TO_CACHE = [
   "/assets/fonts/martel-v4-latin/martel-v4-latin-regular.woff2",
   "/synchronising.svg",
   "/synchronised.svg",
+  "/quality-high.svg",
+  "/quality-medium.svg",
+  "/quality-low.svg",
 ]
 const FILE_ALIASES = new Map([["/", "/index.html"]])