diff --git a/requirements.txt b/requirements.txt
index 16223d6..911f0e5 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,4 +22,4 @@
 os-testr>=1.0.0 # Apache-2.0
 urllib3>=1.21.1 # MIT
 debtcollector>=1.2.0 # Apache-2.0
-unittest2 # BSD
+unittest2>=1.1.0 # BSD