diff --git a/package.json b/package.json
index 1eafe34..8c81694 100644
--- a/package.json
+++ b/package.json
@@ -61,7 +61,7 @@
     "conventional-github-releaser": "2.0.2",
     "core-js": "2.5.7",
     "css-loader": "0.28.11",
-    "cssnano": "3.10.0",
+    "cssnano": "4.0.0",
     "del": "3.0.0",
     "gulp": "3.9.1",
     "gulp-bump": "3.1.1",