diff --git a/requirements.txt b/requirements.txt
index ea4963e..0ad5699 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
 argparse==1.2.1
 clint==0.3.1
 numpy==1.7.1
+progressbar==2.3
 pymc==2.2
 wsgiref==0.1.2