diff --git a/package.json b/package.json
index 4f8d2054e..bacac92ae 100644
--- a/package.json
+++ b/package.json
@@ -56,7 +56,7 @@
     "autoprefixer": "10.4.13",
     "body-parser": "1.19.2",
     "browser-sync": "2.27.10",
-    "clean-css": "5.2.4",
+    "clean-css": "5.3.3",
     "cssgrace": "3.0.0",
     "cssgrace-lite": "1.0.1",
     "ejs": "3.1.8",