diff --git a/package-lock.json b/package-lock.json
index 521f3d5..0bfe55c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -727,9 +727,9 @@
       }
     },
     "clean-css": {
-      "version": "4.1.9",
-      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.1.9.tgz",
-      "integrity": "sha1-Nc7ornaHpJuYA09w3gDE7dOCYwE=",
+      "version": "4.1.11",
+      "resolved": "https://registry.npmjs.org/clean-css/-/clean-css-4.1.11.tgz",
+      "integrity": "sha1-Ls3xRaujj1R0DybO/Q/z4D4SXWo=",
       "dev": true,
       "requires": {
         "source-map": "0.5.x"