diff --git a/etc/requirements.txt b/etc/requirements.txt
index 42da12a3..a1165d6d 100644
--- a/etc/requirements.txt
+++ b/etc/requirements.txt
@@ -8,7 +8,7 @@ blist==1.3.4
 
 # Scientific Libraries
 
-pytz==2012j
+pytz==2013b
 numpy==1.7.0
 
 pandas==0.10.1