diff --git a/requirements.txt b/requirements.txt
index 08058b6..7bd35e2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ Counter==1.0.0
 cycler==0.10.0
 DateTime==4.1.1
 et-xmlfile==1.0.1
-httplib2==0.9.2
+httplib2==0.19.0
 jdcal==1.3
 matplotlib==1.5.3
 numpy==1.11.2