diff --git a/requirements/development.txt b/requirements/development.txt
index 6179ee7..da95493 100644
--- a/requirements/development.txt
+++ b/requirements/development.txt
@@ -14,7 +14,7 @@ pytest==3.4.0
 pytest-cov==2.5.1
 tox==3.2.1
 coveralls==1.2.0
-mock==2.0.0
+mock==5.0.2
 
 # docs
 Sphinx==1.6.6