diff --git a/package.json b/package.json
index 560fb1e6d1..ae3b09cda4 100644
--- a/package.json
+++ b/package.json
@@ -25,7 +25,7 @@
     "grunt-jsvalidate": "~0.2.2",
     "grunt-legacy-util": "^0.2.0",
     "grunt-patch-wordpress": "~0.3.0",
-    "grunt-rtlcss": "~1.5.1",
+    "grunt-rtlcss": "~1.6.0",
     "grunt-sass": "~0.18.0",
     "matchdep": "~0.3.0"
   }