diff --git a/etc/requirements.txt b/etc/requirements.txt
index cacd1f80..fcb71304 100644
--- a/etc/requirements.txt
+++ b/etc/requirements.txt
@@ -8,7 +8,7 @@ blist==1.3.4
 
 # Scientific Libraries
 
-pytz==2011n
+pytz==2012h
 numpy==1.6.1
 Cython==0.15.1