diff --git a/package.json b/package.json
index b26c603c..3edf42a8 100644
--- a/package.json
+++ b/package.json
@@ -14,7 +14,7 @@
   "dependencies": {
     "babel-code-frame": "^6.11.0",
     "css-selector-tokenizer": "^0.7.0",
-    "cssnano": ">=2.6.1 <4",
+    "cssnano": ">4.0.0",
     "icss-utils": "^2.1.0",
     "loader-utils": "^1.0.2",
     "lodash.camelcase": "^4.3.0",