diff --git a/package.json b/package.json
index 3622e93..e938f9d 100644
--- a/package.json
+++ b/package.json
@@ -31,7 +31,7 @@
     "node": ">=12.0.0"
   },
   "dependencies": {
-    "clean-css": "^4.2.3",
+    "clean-css": "^5.1.4",
     "core-js": "^3.8.1",
     "uglify-js": "^3.12.0"
   },
diff --git a/yarn.lock b/yarn.lock
index ff87e99..f0e17f2 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -205,10 +205,10 @@ ci-info@^2.0.0:
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
   integrity sha512-5tK7EtrZ0N+OLFMthtqOj4fI2Jeb88C4CAZPu25LDVUgXJ0A3Js4PMGqrn0JU1W0Mh1/Z8wZzYPxqUrXeBboCQ==
 
-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==
+clean-css@^5.1.4:
+  version "5.1.4"
+  resolved "https://registry.yarnpkg.com/clean-css/-/clean-css-5.1.4.tgz#d191c98347f9fc36b301f99bb827898151175782"
+  integrity sha512-e6JAuR0T2ahg7fOSv98Nxqh7mHWOac5TaCSgrr61h/6mkPLwlxX38hzob4h6IKj/UHlrrLXvAEjWqXlvi8r8lQ==
   dependencies:
     source-map "~0.6.0"