diff --git a/package-lock.json b/package-lock.json
index 061e0dd048..2c58362238 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -49,7 +49,7 @@
         "ember-cli-app-version": "^6.0.1",
         "ember-cli-babel": "^8.0.0",
         "ember-cli-bundle-analyzer": "^1.0.0",
-        "ember-cli-clean-css": "^2.0.0",
+        "ember-cli-clean-css": "^3.0.0",
         "ember-cli-code-coverage": "^v2.0.0",
         "ember-cli-dependency-checker": "^3.3.2",
         "ember-cli-dependency-lint": "2.0.1",
@@ -25444,43 +25444,15 @@
       "license": "ISC"
     },
     "node_modules/clean-css": {
-      "version": "3.4.28",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-3.4.28.tgz",
-      "integrity": "sha512-aTWyttSdI2mYi07kWqHi24NUU9YlELFKGOAgFzZjDN1064DMAOy2FBuoyGmkKRlXkbpXd0EVHmiVkbKhKoirTw==",
-      "dev": true,
-      "dependencies": {
-        "commander": "2.8.x",
-        "source-map": "0.4.x"
-      },
-      "bin": {
-        "cleancss": "bin/cleancss"
-      },
-      "engines": {
-        "node": ">=0.10.0"
-      }
-    },
-    "node_modules/clean-css/node_modules/commander": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
-      "integrity": "sha512-+pJLBFVk+9ZZdlAOB5WuIElVPPth47hILFkmGym57aq8kwxsowvByvB0DHs1vQAhyMZzdcpTtF0VDKGkSDR4ZQ==",
-      "dev": true,
-      "dependencies": {
-        "graceful-readlink": ">= 1.0.0"
-      },
-      "engines": {
-        "node": ">= 0.6.x"
-      }
-    },
-    "node_modules/clean-css/node_modules/source-map": {
-      "version": "0.4.4",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
-      "integrity": "sha512-Y8nIfcb1s/7DcobUz1yOO1GSp7gyL+D9zLHDehT7iRESqGSxjJ448Sg7rvfgsRJCnKLdSl11uGf0s9X80cH0/A==",
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.2.tgz",
+      "integrity": "sha512-JVJbM+f3d3Q704rF4bqQ5UUyTtuJ0JRKNbTKVEeujCCBoMdkEi+V+e8oktO9qGQNSvHrFTM6JZRXrUvGR1czww==",
       "dev": true,
       "dependencies": {
-        "amdefine": ">=0.0.4"
+        "source-map": "~0.6.0"
       },
       "engines": {
-        "node": ">=0.8.0"
+        "node": ">= 10.0"
       }
     },
     "node_modules/clean-stack": {
@@ -31983,13 +31955,13 @@
       }
     },
     "node_modules/ember-cli-clean-css": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ember-cli-clean-css/-/ember-cli-clean-css-2.0.0.tgz",
-      "integrity": "sha512-je5QnB/Ms5641Oh8tv2CWKXGWeeiXxOGpqIuLq/XybERV6CdRGrQ7jNiAWBc4/P6vdoIqw5kjrC9nxVGwWWs9Q==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ember-cli-clean-css/-/ember-cli-clean-css-3.0.0.tgz",
+      "integrity": "sha512-BbveJCyRvzzkaTH1llLW+MpHe/yzA5zpHOpMIg2vp/3JD9mban9zUm7lphaB0TSpPuMuby9rAhTI8pgXq0ifIA==",
       "dev": true,
       "dependencies": {
         "broccoli-persistent-filter": "^3.1.3",
-        "clean-css": "^3.4.28",
+        "clean-css": "^5.3.2",
         "json-stable-stringify": "^1.0.1"
       },
       "engines": {
@@ -65963,12 +65935,6 @@
       "dev": true,
       "license": "ISC"
     },
-    "node_modules/graceful-readlink": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
-      "integrity": "sha512-8tLu60LgxF6XpdbK8OW3FA+IfTNBn1ZHGHKF4KQbEeSkajYw5PlYJcKluntgegDPTg8UkHjpet1T82vk6TQ68w==",
-      "dev": true
-    },
     "node_modules/graphemer": {
       "version": "1.4.0",
       "dev": true,
@@ -99481,33 +99447,12 @@
       "dev": true
     },
     "clean-css": {
-      "version": "3.4.28",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-3.4.28.tgz",
-      "integrity": "sha512-aTWyttSdI2mYi07kWqHi24NUU9YlELFKGOAgFzZjDN1064DMAOy2FBuoyGmkKRlXkbpXd0EVHmiVkbKhKoirTw==",
+      "version": "5.3.2",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-5.3.2.tgz",
+      "integrity": "sha512-JVJbM+f3d3Q704rF4bqQ5UUyTtuJ0JRKNbTKVEeujCCBoMdkEi+V+e8oktO9qGQNSvHrFTM6JZRXrUvGR1czww==",
       "dev": true,
       "requires": {
-        "commander": "2.8.x",
-        "source-map": "0.4.x"
-      },
-      "dependencies": {
-        "commander": {
-          "version": "2.8.1",
-          "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
-          "integrity": "sha512-+pJLBFVk+9ZZdlAOB5WuIElVPPth47hILFkmGym57aq8kwxsowvByvB0DHs1vQAhyMZzdcpTtF0VDKGkSDR4ZQ==",
-          "dev": true,
-          "requires": {
-            "graceful-readlink": ">= 1.0.0"
-          }
-        },
-        "source-map": {
-          "version": "0.4.4",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
-          "integrity": "sha512-Y8nIfcb1s/7DcobUz1yOO1GSp7gyL+D9zLHDehT7iRESqGSxjJ448Sg7rvfgsRJCnKLdSl11uGf0s9X80cH0/A==",
-          "dev": true,
-          "requires": {
-            "amdefine": ">=0.0.4"
-          }
-        }
+        "source-map": "~0.6.0"
       }
     },
     "clean-stack": {
@@ -104957,13 +104902,13 @@
       }
     },
     "ember-cli-clean-css": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/ember-cli-clean-css/-/ember-cli-clean-css-2.0.0.tgz",
-      "integrity": "sha512-je5QnB/Ms5641Oh8tv2CWKXGWeeiXxOGpqIuLq/XybERV6CdRGrQ7jNiAWBc4/P6vdoIqw5kjrC9nxVGwWWs9Q==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ember-cli-clean-css/-/ember-cli-clean-css-3.0.0.tgz",
+      "integrity": "sha512-BbveJCyRvzzkaTH1llLW+MpHe/yzA5zpHOpMIg2vp/3JD9mban9zUm7lphaB0TSpPuMuby9rAhTI8pgXq0ifIA==",
       "dev": true,
       "requires": {
         "broccoli-persistent-filter": "^3.1.3",
-        "clean-css": "^3.4.28",
+        "clean-css": "^5.3.2",
         "json-stable-stringify": "^1.0.1"
       }
     },
@@ -132631,12 +132576,6 @@
       "version": "4.2.11",
       "dev": true
     },
-    "graceful-readlink": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
-      "integrity": "sha512-8tLu60LgxF6XpdbK8OW3FA+IfTNBn1ZHGHKF4KQbEeSkajYw5PlYJcKluntgegDPTg8UkHjpet1T82vk6TQ68w==",
-      "dev": true
-    },
     "graphemer": {
       "version": "1.4.0",
       "dev": true
diff --git a/package.json b/package.json
index aba76b8087..699bf6cab6 100644
--- a/package.json
+++ b/package.json
@@ -63,7 +63,7 @@
     "ember-cli-app-version": "^6.0.1",
     "ember-cli-babel": "^8.0.0",
     "ember-cli-bundle-analyzer": "^1.0.0",
-    "ember-cli-clean-css": "^2.0.0",
+    "ember-cli-clean-css": "^3.0.0",
     "ember-cli-code-coverage": "^v2.0.0",
     "ember-cli-dependency-checker": "^3.3.2",
     "ember-cli-dependency-lint": "2.0.1",