diff --git a/highcharts/highcharts/highcharts.py b/highcharts/highcharts/highcharts.py
index e7c1ef6..e99df62 100644
--- a/highcharts/highcharts/highcharts.py
+++ b/highcharts/highcharts/highcharts.py
@@ -10,7 +10,7 @@
 import json, uuid
 import re
 import datetime
-import urllib2
+import urllib.request, urllib.error, urllib.parse
 import html
 from collections import Iterable
 from .options import BaseOptions, ChartOptions, ColorAxisOptions, \
@@ -334,7 +334,7 @@ def buildhtmlheader(self):
 
 
         if self.offline:
-            opener = urllib2.build_opener()
+            opener = urllib.request.build_opener()
             opener.addheaders = [('User-Agent', 'Mozilla/5.0')]
 
             self.header_css = [