diff --git a/requirements-dev.txt b/requirements-dev.txt
index 4d74f6d15..bfb941152 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,5 +1,5 @@
 coverage==4.4.2
 flake8==3.5.0
-mock>=1.0.1
+mock==2.0.0
 pytest==3.6.3
 pytest-cov==2.5.1