diff --git a/test-requirements.txt b/test-requirements.txt
index 7a1fcc1..c821bb3 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -7,3 +7,4 @@ sphinx>=1.1.2,!=1.2.0,<1.3
 oslosphinx>=2.2.0  # Apache-2.0
 
 oslotest>=1.1.0  # Apache-2.0
+coverage>=3.6