diff --git a/requirements.txt b/requirements.txt
old mode 100755
new mode 100644
index e90c92e..1ec07f6
--- a/requirements.txt
+++ b/requirements.txt
@@ -30,7 +30,7 @@ google-cloud-storage==1.22.0
 google-resumable-media==0.4.1
 googleapis-common-protos==1.6.0
 grpcio==1.25.0
-httplib2==0.14.0
+httplib2==0.19.0
 idna==2.8
 itsdangerous==1.1.0
 Jinja2==2.10.3