diff --git a/src/package-lock.json b/src/package-lock.json
index 6e70f432c..23bc3df8a 100644
--- a/src/package-lock.json
+++ b/src/package-lock.json
@@ -1121,9 +1121,9 @@
       "optional": true
     },
     "clean-css": {
-      "version": "5.2.1",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.2.1.tgz",
-      "integrity": "sha512-ooQCa1/70oRfVdUUGjKpbHuxgMgm8BsDT5EBqBGvPxMoRoGXf4PNx5mMnkjzJ9Ptx4vvmDdha0QVh86QtYIk1g==",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.1.tgz",
+      "integrity": "sha512-lCr8OHhiWCTw4v8POJovCoh4T7I9U11yVsPjMWWnnMmp9ZowCxyad1Pathle/9HjaDp+fdQKjO9fQydE6RHTZg==",
       "requires": {
         "source-map": "~0.6.0"
       }
diff --git a/src/package.json b/src/package.json
index c8b4e3408..a24f031f3 100644
--- a/src/package.json
+++ b/src/package.json
@@ -31,7 +31,7 @@
   ],
   "dependencies": {
     "async": "^3.2.1",
-    "clean-css": "^5.2.1",
+    "clean-css": "^5.3.1",
     "cookie-parser": "1.4.5",
     "cross-spawn": "^7.0.3",
     "ejs": "^3.1.6",