diff --git a/package.json b/package.json
index 7f568052a7..c383b20d3a 100644
--- a/package.json
+++ b/package.json
@@ -16,7 +16,7 @@
     "grunt-contrib-concat": "~0.5.0",
     "grunt-contrib-copy": "~0.5.0",
     "grunt-contrib-cssmin": "~0.10.0",
-    "grunt-contrib-imagemin": "~0.4.1",
+    "grunt-contrib-imagemin": "~0.9.1",
     "grunt-contrib-jshint": "~0.10.0",
     "grunt-contrib-qunit": "~0.5.2",
     "grunt-contrib-uglify": "~0.5.0",