diff --git a/handler.py b/handler.py
index dbc2d26..4b2ddc4 100644
--- a/handler.py
+++ b/handler.py
@@ -2,13 +2,13 @@
 import tornado.ioloop, tornado.web, tornado.autoreload
 from tornado.escape import json_encode, json_decode
 
-import safeurl, types, sys, re, mimetypes, glob, jsbeautifier, urlparse, pycurl
+import safeurl, types, sys, re, mimetypes, glob, jsbeautifier, urllib.parse, pycurl
 import calendar, time, datetime
 
 from netaddr import *
 from collections import defaultdict
 from bs4 import BeautifulSoup
-from cgi import escape
+from html import escape
 
 #------------------------------------------------------------
 # Base / Status Code Handlers
diff --git a/safeurl.py b/safeurl.py
index a9be918..4c5ebf8 100644
--- a/safeurl.py
+++ b/safeurl.py
@@ -15,7 +15,7 @@
 import re
 import netaddr
 import pycurl
-import StringIO
+import io
 
 # Python 2.7/3 urlparse
 try:
@@ -707,7 +707,7 @@ def execute(self, url):
                 self._handle.setopt(pycurl.URL, url["cleanUrl"])
 
             # Execute the cURL request
-            response = StringIO.StringIO()
+            response = io.BytesIO()
             self._handle.setopt(pycurl.WRITEFUNCTION, response.write)
             self._handle.perform()
 
@@ -729,4 +729,5 @@ def execute(self, url):
             if not redirected:
                 break
 
-        return response.getvalue()
+        return response.getvalue().decode('utf-8')
+
diff --git a/setup.py b/setup.py
index 87c8cbc..fd53ebd 100644
--- a/setup.py
+++ b/setup.py
@@ -9,6 +9,6 @@
     long_description=open('README.md').read(),
     author='Ben Sadeghipour',
     url='https://github.com/nahamsec/JSParser',
-    install_requires=['safeurl', 'tornado', 'jsbeautifier',
+    install_requires=['safeurl', 'tornado<=5.1', 'jsbeautifier',
                       'netaddr', 'pycurl', 'BeautifulSoup4'],
 )