diff --git a/package.json b/package.json
index 9e093639e5..f46a4406f6 100644
--- a/package.json
+++ b/package.json
@@ -50,7 +50,7 @@
     "buble": "^0.19.7",
     "buble-loader": "^0.5.1",
     "chaikin-smooth": "^1.0.4",
-    "clean-css-cli": "4.2.1",
+    "clean-css-cli": "4.3.0",
     "copy-webpack-plugin": "^5.0.1",
     "coveralls": "3.0.3",
     "eslint": "^5.15.2",