diff --git a/Makefile b/Makefile
index a316c2e..37629fd 100644
--- a/Makefile
+++ b/Makefile
@@ -37,7 +37,7 @@ min-css:
 min-js:
 	echo "// @source https://github.com/nokonoko/uguu/tree/master/static/js" > $(CURDIR)/build/uguu.min.js 
 	echo "// @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt Expat" >> $(CURDIR)/build/uguu.min.js
-	$(NODE) $(CURDIR)/node_modules/.bin/uglifyjs  --screw-ie8 ./static/js/app.js >> $(CURDIR)/build/uguu.min.js 
+	$(NODE) $(CURDIR)/node_modules/.bin/uglifyjs ./static/js/app.js >> $(CURDIR)/build/uguu.min.js 
 	echo "// @license-end" >> $(CURDIR)/build/uguu.min.js
 
 copy-img:
diff --git a/package.json b/package.json
index 5426680..bbd8cec 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
   "devDependencies": {
     "clean-css": "^4.2.1",
     "clean-css-cli": "^4.3.0",
-    "uglify-js": "^2.6.2",
+    "uglify-js": "^3.13.9",
     "swig": "^1.4.2"
   },
   "dependencies": {