diff --git a/lib/modules/browserify.coffee b/lib/modules/browserify.coffee
index c8497e1..51bfe99 100644
--- a/lib/modules/browserify.coffee
+++ b/lib/modules/browserify.coffee
@@ -13,17 +13,31 @@ class exports.BrowserifyAsset extends Asset
         @require = options.require
         @debug = options.debug or false
         @compress = options.compress
+        @external = options.external
+        @transform = options.transform
         @compress ?= false
         @extensionHandlers = options.extensionHandlers or []
         agent = browserify watch: false, debug: @debug
         for handler in @extensionHandlers
             agent.register(handler.ext, handler.handler)
-        agent.addEntry @filename
-        agent.require @require if @require
-        if @compress is true
-            uncompressed = agent.bundle()
-            @contents = uglify.minify(uncompressed, {fromString: true}).code
-            @emit 'created'
-        else
-            @emit 'created', contents: agent.bundle()
+        agent.add @filename if @filename
 
+        if @require
+            for r in @require
+                if r.file
+                    agent.require r.file, r.options
+                else
+                    agent.require r
+
+        agent.external ext for ext in @external if @external
+        agent.transform t for t in @transform if @transform
+
+        agent.transform 'coffeeify' if /.coffee$/.test @filename
+
+        agent.bundle (error, src) =>
+            return @emit 'error', error if error?
+            if @compress is true
+                @contents = uglify.minify(src, {fromString: true}).code
+                @emit 'created'
+            else
+                @emit 'created', contents: src
diff --git a/package.json b/package.json
index 72629eb..fd7deb3 100644
--- a/package.json
+++ b/package.json
@@ -5,7 +5,7 @@
   "author": "Brad Carleton <brad@techpines.com>",
   "repository": "https://github.com/techpines/asset-rack",
   "dependencies": {
-    "browserify": "1.17.3",
+    "browserify": "~2.34.0",
     "snockets": "~1.3.8",
     "uglify-js": "~2.4.0",
     "async": "~0.2.9",
@@ -17,6 +17,7 @@
     "stylus": "~0.38.0",
     "underscore": "~1.5.2",
     "coffee-script": "~1.6.3",
+    "coffeeify": "~0.5.0",
     "markdown": "~0.5.0",
     "node-sassy": "~0.0.1"
   },