diff --git a/package.json b/package.json
index ef574cf..576f183 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "markdown-it": "^8.4.0",
     "nyc": "^11.4.1",
     "postcss": "^6.0.16",
-    "postcss-nested": "^3.0.0",
+    "postcss-nested": "^4.0.0",
     "reshape": "^0.5.0",
     "snazzy": "^7.0.0",
     "standard": "^10.0.3",