diff --git a/requirements.txt b/requirements.txt
index d85ff9d..5ae19f5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -57,7 +57,7 @@ grpc-google-iam-v1==0.11.4
 grpcio==1.11.0
 gunicorn==19.8.1
 hiredis==0.2.0
-httplib2==0.11.3
+httplib2==0.18.0
 idna==2.6
 idna-ssl==1.0.1
 isort==4.3.4
@@ -153,7 +153,7 @@ grpc-google-iam-v1==0.11.4
 grpcio==1.11.0
 gunicorn==19.8.1
 hiredis==0.2.0
-httplib2==0.11.3
+httplib2==0.18.0
 idna==2.6
 idna-ssl==1.0.1
 isort==4.3.4
@@ -258,7 +258,7 @@ grpc-google-iam-v1==0.11.4
 grpcio==1.11.0
 gunicorn==19.8.1
 hiredis==0.2.0
-httplib2==0.11.3
+httplib2==0.18.0
 idna==2.6
 idna-ssl==1.0.1
 isort==4.3.4