diff --git a/requirements.txt b/requirements.txt
index 5c814db..bba4940 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ django-reversion==2.0.13
 djangorestframework==3.8.2
 et-xmlfile==1.0.1
 future==0.16.0
-httplib2==0.11.3
+httplib2==0.18.0
 idna==2.6
 itypes==1.1.0
 jdcal==1.4