diff --git a/package.json b/package.json
index 031e3395..1475c2b6 100644
--- a/package.json
+++ b/package.json
@@ -15,9 +15,9 @@
         "url": "https://github.com/mishoo/UglifyJS2.git"
     },
     "dependencies": {
-        "async"      : "~0.2.6",
+        "async"      : "~0.9.0",
         "source-map" : "~0.1.33",
-        "optimist"   : "~0.3.5",
+        "optimist"   : "~0.6.1",
         "uglify-to-browserify": "~1.0.0"
     },
     "browserify": {