diff --git a/requirements.txt b/requirements.txt
index c7a1430..8d71848 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ Flask==1.0.2
 google-api-python-client==1.7.4
 google-auth==1.6.1
 google-auth-httplib2==0.0.3
-httplib2==0.12.0
+httplib2==0.19.0
 idna==2.7
 inflection==0.3.1
 itsdangerous==1.1.0