diff --git a/test-requirements.txt b/test-requirements.txt
index 8ba25c9..2f2fedf 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
 bandit>=1.1.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
-mock>=2.0 # BSD
+mock>=2.0.0 # BSD
 sphinx>=1.6.2 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 oslotest>=1.10.0 # Apache-2.0