diff --git a/package.json b/package.json
index 1ea8e8e..4f9fd8e 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,7 @@
 		"jshint": "~2.1.3",
 		"mocha": "~1.10.0",
 		"karma": "~0.8.5",
-		"uglify-js": "~2.3.6",
+		"uglify-js": "~3.7.7",
 		"jake": "~0.5.16"
 	},
 	"main": "dist/leaflet.pattern.js",