diff --git a/package-lock.json b/package-lock.json
index 704f0892a002..c10a789b17b6 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "@rollup/plugin-replace": "^3.0.1",
         "autoprefixer": "^10.4.2",
         "bundlewatch": "^0.3.3",
-        "clean-css-cli": "^5.5.0",
+        "clean-css-cli": "^5.6.1",
         "cpy-cli": "^3.1.1",
         "cross-env": "^7.0.3",
         "cspell": "^5.15.2",
@@ -3859,9 +3859,9 @@
       }
     },
     "node_modules/clean-css": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.2.2.tgz",
-      "integrity": "sha512-/eR8ru5zyxKzpBLv9YZvMXgTSSQn7AdkMItMYynsFgGwTveCRVam9IUPFloE85B4vAIj05IuKmmEoV7/AQjT0w==",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.1.tgz",
+      "integrity": "sha512-lCr8OHhiWCTw4v8POJovCoh4T7I9U11yVsPjMWWnnMmp9ZowCxyad1Pathle/9HjaDp+fdQKjO9fQydE6RHTZg==",
       "dev": true,
       "dependencies": {
         "source-map": "~0.6.0"
@@ -3871,13 +3871,13 @@
       }
     },
     "node_modules/clean-css-cli": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.5.0.tgz",
-      "integrity": "sha512-Vr9t8o59YaPcRw/4hyJjEh4zU/BlOtlJJ8465El6QMYWbkf5nN1mhAljX6FIb0bfpkGlYNFKPCyTz7oFCHOblQ==",
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.6.1.tgz",
+      "integrity": "sha512-/StJu1YODZY6cOwkBx5FMhSoc9YmvEJXtwNN+udGg1GIKrr4PkdsCdUqC26GfdPdt5IuZnu+5y9/3mrdIJa40Q==",
       "dev": true,
       "dependencies": {
         "chokidar": "^3.5.2",
-        "clean-css": "^5.2.2",
+        "clean-css": "^5.3.1",
         "commander": "7.x",
         "glob": "^7.1.6"
       },
@@ -17387,9 +17387,9 @@
       }
     },
     "clean-css": {
-      "version": "5.2.2",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.2.2.tgz",
-      "integrity": "sha512-/eR8ru5zyxKzpBLv9YZvMXgTSSQn7AdkMItMYynsFgGwTveCRVam9IUPFloE85B4vAIj05IuKmmEoV7/AQjT0w==",
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.1.tgz",
+      "integrity": "sha512-lCr8OHhiWCTw4v8POJovCoh4T7I9U11yVsPjMWWnnMmp9ZowCxyad1Pathle/9HjaDp+fdQKjO9fQydE6RHTZg==",
       "dev": true,
       "requires": {
         "source-map": "~0.6.0"
@@ -17404,13 +17404,13 @@
       }
     },
     "clean-css-cli": {
-      "version": "5.5.0",
-      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.5.0.tgz",
-      "integrity": "sha512-Vr9t8o59YaPcRw/4hyJjEh4zU/BlOtlJJ8465El6QMYWbkf5nN1mhAljX6FIb0bfpkGlYNFKPCyTz7oFCHOblQ==",
+      "version": "5.6.1",
+      "resolved": "https://registry.npmjs.org/clean-css-cli/-/clean-css-cli-5.6.1.tgz",
+      "integrity": "sha512-/StJu1YODZY6cOwkBx5FMhSoc9YmvEJXtwNN+udGg1GIKrr4PkdsCdUqC26GfdPdt5IuZnu+5y9/3mrdIJa40Q==",
       "dev": true,
       "requires": {
         "chokidar": "^3.5.2",
-        "clean-css": "^5.2.2",
+        "clean-css": "^5.3.1",
         "commander": "7.x",
         "glob": "^7.1.6"
       },
diff --git a/package.json b/package.json
index 2d582868ac91..18b2274a1365 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "@rollup/plugin-replace": "^3.0.1",
     "autoprefixer": "^10.4.2",
     "bundlewatch": "^0.3.3",
-    "clean-css-cli": "^5.5.0",
+    "clean-css-cli": "^5.6.1",
     "cpy-cli": "^3.1.1",
     "cross-env": "^7.0.3",
     "cspell": "^5.15.2",