diff --git a/setup.py b/setup.py
index 0b5b2e5..6c9bf9a 100644
--- a/setup.py
+++ b/setup.py
@@ -73,7 +73,10 @@ requires = [
     'decorator',                        # 3.3.2
     'lockfile',                         # 0.9.1
     'progressbar',                      # 2.3
-    'pytz',                             # 2012b
+
+    # Hardcode ``pytz`` minimum since apparently it isn't (any longer?) enough
+    # to simply require the library.
+    'pytz>=2013b',                      #                       2013b 
     ]
 
 if sys.version_info < (2, 7):