diff --git a/python-server/guestbook/requirements.txt b/python-server/guestbook/requirements.txt
index 836a582..c240c30 100644
--- a/python-server/guestbook/requirements.txt
+++ b/python-server/guestbook/requirements.txt
@@ -6,7 +6,7 @@ beautifulsoup4==4.3.2
 PyHamcrest==1.8.0
 six==1.9.0
 httplib2
-urllib3==2.5.0
+urllib3==2.6.0
 google-api-python-client>=0
 oauth2client>=1.3
 uritemplate>=0.6