diff --git a/package.json b/package.json
index 3dcc2ca6..bef62db2 100644
--- a/package.json
+++ b/package.json
@@ -11,6 +11,7 @@
     "grunt-jsonlint": "1.1.0",
     "grunt-stylelint": "0.9.0",
     "stylelint": "8.2.0",
-    "stylelint-config-wikimedia": "0.4.2"
+    "stylelint-config-wikimedia": "0.4.2",
+    "postcss-less": "1.1.3"
   }
 }