diff --git a/package.json b/package.json
index 4cc5d7913..0779cddc7 100755
--- a/package.json
+++ b/package.json
@@ -70,7 +70,8 @@
     "browserslist": "^4.16.5",
     "ws": "^7.4.6",
     "css-what": "^5.0.1",
-    "trim-newlines": "^3.0.1"
+    "trim-newlines": "^3.0.1",
+    "clean-css": "^4.1.11"
   },
   "config": {
     "commitizen": {
diff --git a/yarn.lock b/yarn.lock
index 885c2f00a..7d5c7f403 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6604,15 +6604,7 @@ clean-css-promise@^0.1.0:
     clean-css "^3.4.5"
     pinkie-promise "^2.0.0"
 
-clean-css@^3.4.5:
-  version "3.4.28"
-  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-3.4.28.tgz#bf1945e82fc808f55695e6ddeaec01400efd03ff"
-  integrity sha1-vxlF6C/ICPVWlebd6uwBQA79A/8=
-  dependencies:
-    commander "2.8.x"
-    source-map "0.4.x"
-
-clean-css@^4.2.3:
+clean-css@^3.4.5, clean-css@^4.1.11, clean-css@^4.2.3:
   version "4.2.3"
   resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-4.2.3.tgz#507b5de7d97b48ee53d84adb0160ff6216380f78"
   integrity sha512-VcMWDN54ZN/DS+g58HYL5/n4Zrqe8vHJpGA8KdgUXFU4fuP/aHNw8eld9SyEIyabIMJX/0RaY/fplOo5hYLSFA==
@@ -6904,13 +6896,6 @@ comma-separated-tokens@^1.0.0:
   resolved "https://registry.yarnpkg.com/comma-separated-tokens/-/comma-separated-tokens-1.0.8.tgz#632b80b6117867a158f1080ad498b2fbe7e3f5ea"
   integrity sha512-GHuDRO12Sypu2cV70d1dkA2EUmXHgntrzbpvOB+Qy+49ypNfGgFQIC2fhhXbnyrJRynDCAARsT7Ou0M6hirpfw==
 
-commander@2.8.x:
-  version "2.8.1"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.8.1.tgz#06be367febfda0c330aa1e2a072d3dc9762425d4"
-  integrity sha1-Br42f+v9oMMwqh4qBy09yXYkJdQ=
-  dependencies:
-    graceful-readlink ">= 1.0.0"
-
 commander@7.1.0:
   version "7.1.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-7.1.0.tgz#f2eaecf131f10e36e07d894698226e36ae0eb5ff"
@@ -11667,11 +11652,6 @@ graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.3
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.6.tgz#ff040b2b0853b23c3d31027523706f1885d76bee"
   integrity sha512-nTnJ528pbqxYanhpDYsi4Rd8MAeaBA67+RZ10CM1m3bTAVFEDcd5AuA4a6W5YkGZ1iNXHzZz8T6TBKLeBuNriQ==
 
-"graceful-readlink@>= 1.0.0":
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/graceful-readlink/-/graceful-readlink-1.0.1.tgz#4cafad76bc62f02fa039b2f94e9a3dd3a391a725"
-  integrity sha1-TK+tdrxi8C+gObL5Tpo906ORpyU=
-
 growl@1.10.5:
   version "1.10.5"
   resolved "https://registry.yarnpkg.com/growl/-/growl-1.10.5.tgz#f2735dc2283674fa67478b10181059355c369e5e"
@@ -19220,7 +19200,7 @@ source-map-url@^0.4.0:
   resolved "https://registry.yarnpkg.com/source-map-url/-/source-map-url-0.4.1.tgz#0af66605a745a5a2f91cf1bbf8a7afbc283dec56"
   integrity sha512-cPiFOTLUKvJFIg4SKVScy4ilPPW6rFgMgfuZJPNoDuMs3nC1HbMUycBoJw77xFIp6z1UJQJOfx6C9GMH80DiTw==
 
-source-map@0.4.x, source-map@^0.4.2:
+source-map@^0.4.2:
   version "0.4.4"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.4.4.tgz#eba4f5da9c0dc999de68032d8b4f76173652036b"
   integrity sha1-66T12pwNyZneaAMti092FzZSA2s=