diff --git a/bin/prepublish.js b/bin/prepublish.js
index e3ef5dd..ac8b01a 100755
--- a/bin/prepublish.js
+++ b/bin/prepublish.js
@@ -7,7 +7,10 @@ var path = require('path');
 
 var uglify = spawn(
     process.execPath,
-    [require.resolve('uglify-js/bin/uglifyjs'), '--wrap-iife', '-c', 'side_effects=false,screw_ie8=false', '--verbose', '--ie8', '--passes=5', '-m', '--source-map', '--', '-']
+    [require.resolve('uglify-js/bin/uglifyjs'), '-c', 'unused=false,expression=true', '--ie8', '-m'],
+    {
+        stdio: ['pipe', 'pipe', 'inherit']
+    }
 );
 
 fs.createReadStream(path.join(__dirname, '..', 'prelude.js'))
diff --git a/package.json b/package.json
index 25e1f63..6eb637c 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "convert-source-map": "~1.1.0",
     "parse-base64vlq-mappings": "~0.1.1",
     "tap": "^10.7.2",
-    "uglify-js": "^2.8.29"
+    "uglify-js": "^3.12.8"
   },
   "scripts": {
     "test": "tap test/*.js",