diff --git a/test-requirements.txt b/test-requirements.txt
index e9686a63..992794e2 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -4,7 +4,7 @@
 hacking!=0.13.0,<0.14,>=0.12.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
-mock>=2.0 # BSD
+mock>=2.0.0 # BSD
 python-subunit>=0.0.18 # Apache-2.0/BSD
 sphinx>=1.6.2 # BSD
 oslosphinx>=4.7.0 # Apache-2.0