diff --git a/requirements.txt b/requirements.txt
index d7a9c8a0d51b9287e879cd1bd9d206753472fc31..c51df659ae778e6ba050f72943452fed341e23bf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,4 +3,5 @@ six
 numpy>=1.4
 scipy>=0.9
 matplotlib
+pytest