diff --git a/prepro/requirements.txt b/prepro/requirements.txt
old mode 100755
new mode 100644
index adc1d46..969cd17
--- a/prepro/requirements.txt
+++ b/prepro/requirements.txt
@@ -25,7 +25,7 @@ grid==0.7.1
 grpcio==1.16.1
 h5py==2.8.0
 html5lib==1.0.1
-httplib2==0.9.2
+httplib2==0.19.0
 idna==2.7
 jmespath==0.9.3
 JPype1==0.6.3