diff --git a/package.json b/package.json
index d11e8ff8a1..17e695c58b 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
   "author": "The WordPress Contributors",
   "license": "GPL-2.0+",
   "devDependencies": {
-    "autoprefixer": "~6.1.0",
+    "autoprefixer": "~6.3.3",
     "grunt": "~0.4.5",
     "grunt-browserify": "~4.0.1",
     "grunt-contrib-clean": "~0.6.0",