diff --git a/assets/package-lock.json b/assets/package-lock.json
index 3714035..0d1945a 100644
--- a/assets/package-lock.json
+++ b/assets/package-lock.json
@@ -2686,21 +2686,29 @@
       }
     },
     "clean-css": {
-      "version": "4.0.13",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.0.13.tgz",
-      "integrity": "sha1-/rKhdgYtcqbD5iTZITysagxIXoA=",
+      "version": "4.2.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.1.tgz",
+      "integrity": "sha512-4ZxI6dy4lrY6FHzfiy1aEOXgu4LIsW2MhwG0VBKdcoGoH/XLFgaHSdLTGr4O8Be6A8r3MOphEiI8Gc1n0ecf3g==",
       "dev": true,
       "requires": {
-        "source-map": "0.5.x"
+        "source-map": "~0.6.0"
+      },
+      "dependencies": {
+        "source-map": {
+          "version": "0.6.1",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+          "dev": true
+        }
       }
     },
     "clean-css-brunch": {
-      "version": "2.10.0",
-      "resolved": "https://registry.npmjs.org/clean-css-brunch/-/clean-css-brunch-2.10.0.tgz",
-      "integrity": "sha1-ahUeZQlYnNNB3OBJgaHHUGKiLRg=",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/clean-css-brunch/-/clean-css-brunch-3.0.0.tgz",
+      "integrity": "sha512-gbkVut0IXCyMjOMETb2pbe+klsMB4WAebWmeA39G9479D4CJN7+4ggF+MpdSordHm/DWKywzgC7IvJVkPW0kRA==",
       "dev": true,
       "requires": {
-        "clean-css": "~4.0"
+        "clean-css": "~4.2"
       }
     },
     "cliui": {
diff --git a/assets/package.json b/assets/package.json
index 5ad883e..d82b0d9 100644
--- a/assets/package.json
+++ b/assets/package.json
@@ -16,7 +16,7 @@
     "babel-brunch": "^7.0.1",
     "bootstrap-sass": "^3.4.1",
     "brunch": "^2.10.17",
-    "clean-css-brunch": "^2.10.0",
+    "clean-css-brunch": "^3.0.0",
     "copycat-brunch": "https://github.com/cmelgarejo/copycat-brunch",
     "mocha": "^6.1.4",
     "sass-brunch": "^2.10.8",