diff --git a/www/package-lock.json b/www/package-lock.json
index dd764d52..8bf961e6 100644
--- a/www/package-lock.json
+++ b/www/package-lock.json
@@ -26,7 +26,7 @@
         "grunt-gh-pages": "^4.0.0",
         "grunt-html": "^17.0.0",
         "grunt-include-replace": "^5.0.0",
-        "grunt-purgecss": "^5.0.0",
+        "grunt-purgecss": "^6.0.0",
         "grunt-sitemap": "^2.0.1",
         "grunt-usemin": "^3.1.1",
         "load-grunt-tasks": "^5.1.0",
@@ -1606,9 +1606,9 @@
       }
     },
     "node_modules/grunt-purgecss": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/grunt-purgecss/-/grunt-purgecss-5.0.0.tgz",
-      "integrity": "sha512-79BA12IdJfhC139OKCYPELDTzUlQtGRwrNnMiKlZkt3ryaHeqd1U8A2fknKeT7dm2Ir4S0AeKTUWpLvol4+lMg==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-purgecss/-/grunt-purgecss-6.0.0.tgz",
+      "integrity": "sha512-BLuPkn06N311c/MMkVlkuAfbubxGbWjGYeCv2Kdb1wBsweWkTRrXQyrQ2OI67xP1hf8F8j/6I92d8Ibvb4b/MA==",
       "dev": true,
       "dependencies": {
         "purgecss": "^5.0.0"
@@ -4930,9 +4930,9 @@
       }
     },
     "grunt-purgecss": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/grunt-purgecss/-/grunt-purgecss-5.0.0.tgz",
-      "integrity": "sha512-79BA12IdJfhC139OKCYPELDTzUlQtGRwrNnMiKlZkt3ryaHeqd1U8A2fknKeT7dm2Ir4S0AeKTUWpLvol4+lMg==",
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/grunt-purgecss/-/grunt-purgecss-6.0.0.tgz",
+      "integrity": "sha512-BLuPkn06N311c/MMkVlkuAfbubxGbWjGYeCv2Kdb1wBsweWkTRrXQyrQ2OI67xP1hf8F8j/6I92d8Ibvb4b/MA==",
       "dev": true,
       "requires": {
         "purgecss": "^5.0.0"
diff --git a/www/package.json b/www/package.json
index c8dcdc68..dd18c812 100644
--- a/www/package.json
+++ b/www/package.json
@@ -36,7 +36,7 @@
     "grunt-gh-pages": "^4.0.0",
     "grunt-html": "^17.0.0",
     "grunt-include-replace": "^5.0.0",
-    "grunt-purgecss": "^5.0.0",
+    "grunt-purgecss": "^6.0.0",
     "grunt-sitemap": "^2.0.1",
     "grunt-usemin": "^3.1.1",
     "load-grunt-tasks": "^5.1.0",