diff --git a/etc/requirements.txt b/etc/requirements.txt
index ecbddd75..9d4d2e28 100644
--- a/etc/requirements.txt
+++ b/etc/requirements.txt
@@ -3,7 +3,7 @@ Logbook==0.9.1
 
 # Scientific Libraries
 
-pytz==2015.2
+pytz==2015.4
 numpy==1.9.2
 
 # scipy and pandas are required for statsmodels,