diff --git a/package.json b/package.json
index d1a71dc..9dbed13 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
   "author": "Brian Sipple <@Brian_Sipple>",
   "license": "MIT",
   "devDependencies": {
-    "cssnano": "^3.9.1",
+    "cssnano": "^4.0.0",
     "del-cli": "^0.2.1",
     "http-server": "^0.9.0",
     "npmpub": "^3.1.0",