diff --git a/dev_requirements.txt b/dev_requirements.txt
index 6fa9de34..058d0e47 100644
--- a/dev_requirements.txt
+++ b/dev_requirements.txt
@@ -5,3 +5,4 @@ docker[tls]==2.5.1
 mock==2.0.0
 pytest-catchlog==1.2.2
 pytest==3.1.2
+unittest2=1.1.0