diff --git a/package-lock.json b/package-lock.json
index a8af68783..c26e93947 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,18 +29,9 @@
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/@wikimedia/less-plugin-clean-css/-/less-plugin-clean-css-1.5.2.tgz",
       "integrity": "sha512-dvYuF01G+vitty/OLvjXfIC6CRQQbEJN9YB6H8qTRowZO03uetIgHoWaPLGBCgvz1QoGYlCvINVv9VsK4h9IVw==",
+      "dev": true,
       "requires": {
         "clean-css": "^4.2.1"
-      },
-      "dependencies": {
-        "clean-css": {
-          "version": "4.2.3",
-          "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.3.tgz",
-          "integrity": "sha512-VcMWDN54ZN/DS+g58HYL5/n4Zrqe8vHJpGA8KdgUXFU4fuP/aHNw8eld9SyEIyabIMJX/0RaY/fplOo5hYLSFA==",
-          "requires": {
-            "source-map": "~0.6.0"
-          }
-        }
       }
     },
     "ajv": {
@@ -73,12 +64,6 @@
         "yargs": "^15.0.1"
       }
     },
-    "amdefine": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
-      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
-      "dev": true
-    },
     "ansi-escapes": {
       "version": "4.3.1",
       "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-4.3.1.tgz",
@@ -204,24 +189,12 @@
       "dev": true
     },
     "clean-css": {
-      "version": "3.4.28",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-3.4.28.tgz",
-      "integrity": "sha1-vxlF6C/ICPVWlebd6uwBQA79A/8=",
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.2.3.tgz",
+      "integrity": "sha512-VcMWDN54ZN/DS+g58HYL5/n4Zrqe8vHJpGA8KdgUXFU4fuP/aHNw8eld9SyEIyabIMJX/0RaY/fplOo5hYLSFA==",
       "dev": true,
       "requires": {
-        "commander": "2.8.x",
-        "source-map": "0.4.x"
-      },
-      "dependencies": {
-        "source-map": {
-          "version": "0.4.4",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.4.4.tgz",
-          "integrity": "sha1-66T12pwNyZneaAMti092FzZSA2s=",
-          "dev": true,
-          "requires": {
-            "amdefine": ">=0.0.4"
-          }
-        }
+        "source-map": "~0.6.0"
       }
     },
     "cli-cursor": {
@@ -343,15 +316,6 @@
         "delayed-stream": "~1.0.0"
       }
     },
-    "commander": {
-      "version": "2.8.1",
-      "resolved": "https://registry.npmjs.org/commander/-/commander-2.8.1.tgz",
-      "integrity": "sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=",
-      "dev": true,
-      "requires": {
-        "graceful-readlink": ">= 1.0.0"
-      }
-    },
     "core-util-is": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
@@ -677,12 +641,6 @@
       "dev": true,
       "optional": true
     },
-    "graceful-readlink": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/graceful-readlink/-/graceful-readlink-1.0.1.tgz",
-      "integrity": "sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=",
-      "dev": true
-    },
     "har-schema": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/har-schema/-/har-schema-2.0.0.tgz",
@@ -916,15 +874,6 @@
         "tslib": "^1.10.0"
       }
     },
-    "less-plugin-clean-css": {
-      "version": "1.5.1",
-      "resolved": "https://registry.npmjs.org/less-plugin-clean-css/-/less-plugin-clean-css-1.5.1.tgz",
-      "integrity": "sha1-zFeveqM5iVflbezr5jy2DCNClwM=",
-      "dev": true,
-      "requires": {
-        "clean-css": "^3.0.1"
-      }
-    },
     "locate-path": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
@@ -1285,7 +1234,8 @@
     "source-map": {
       "version": "0.6.1",
       "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+      "dev": true
     },
     "sprintf-js": {
       "version": "1.0.3",
diff --git a/package.json b/package.json
index c2578010f..1a476e257 100644
--- a/package.json
+++ b/package.json
@@ -23,9 +23,9 @@
   "license": "(OFL-1.1 AND MIT)",
   "dependencies": {},
   "devDependencies": {
+    "@wikimedia/less-plugin-clean-css": "^1.5.2",
     "all-contributors-cli": "^6.16.0",
     "less": "^3.11.3",
-    "@wikimedia/less-plugin-clean-css": "^1.5.2",
     "svgo": "^1.3.2"
   },
   "engines": {