diff --git a/package.json b/package.json
index fdbb7e5..6081d62 100644
--- a/package.json
+++ b/package.json
@@ -33,7 +33,7 @@
     "coffee-script": "^1.11.0",
     "ejs": "^2.3.4",
     "harp-minify": "^0.4.0",
-    "less": "^2.5.3",
+    "less": "^4.0.0",
     "lodash": "^4.16.6",
     "lru-cache": "^4.0.0",
     "marked": "^1.0.0",